The Adventures of Sylvester, the 2018 Suburban 3500 HD and our 2017 Airstream 27FB

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Geotrash

Dave
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This past summer (July 2024), I was lucky enough to get my hands on a 2018 Chevy Suburban 3500 HD. I spent about 2.5 years steadily watching the market for the rarest of these mythical unicorns - one with the LT trim package. Internet rumor holds that only 200 of these trucks were made for the '18 model year, and only a handful of those were LT's. They would come up for sale maybe once or twice a year, but they were usually 2016 model year, higher mileage, and a little dog-eared from 4-7 years of fleet duty.

Finally, "the one" hit the market on eBay Motors this July, and it was a beauty. Only 18K miles, and kept in a climate-controlled garage, just 3 hours from my front door, in Maryland. The guy who bought it new, owned a fleet of trucks, so he was able to pull some strings and get ahold of this one from a dealer in Maine in 2018. I paid $65K for it, which is high, but I plan to keep it for many, many years. It will only see limited towing duty pulling our camper, and will be garage-kept when not being driven. With any luck, it will be the last tow vehicle I ever buy.

I'll use this thread to document any changes or upgrades I make to it, as well as document some of our adventures with it, along the way. The only things I've done to is so far is a Blackbear tune, which was a good decision, and aftermarket crossbars for the roof rack. And the only immediate plans I have for it it to add a transmission dipstick. I have the parts but probably won't get to it until the spring. It's wearing its original tires, but they are flawless, with zero dry rot, flat-spotting, or other signs of age, so I plan to run them for another camping season, next summer.

Long term plans include new tires, of course, along with black wheels, but apart from that, it's a blank canvas. I welcome any ideas and feedback others may have for investments to make in it.

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Geotrash

Geotrash

Dave
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Adding some pics from our adventures with it so far. Towing with it feels effortless in terms of stability, braking, and power with the 4.10 gears. It's more stable than our 2012 Yukon XL Denali (3.42 gears) and spends most of its time on the highway in 5th when towing instead of 4th, with less downshifting needed. Engine and transmission temps are cooler as well, with all factory components. I'd made considerable mods to our 2012, including a cam, thicker radiator and upgraded fans from the K5L package, and a bigger Derale 13960 transmission cooler, but the big burb trans stays 30ºF cooler than our 2012, also likely due to the 4.10 gears. The coolant temp gauge has never moved above the center peg, either.

Lots of folks on the interwebz comment on the factory rated towing capacity on these being only 3,000 lbs., but from an engineering perspective it's actually more capable than the GMT900 2500's were, with bigger brakes, rear axle shafts and springs from the 3500 SRW pickups. But you gotta remember that these were built primarily for armoring, so GM just never bothered with the J2807 towing test for it. It doesn't mean that it can't safely tow MUCH more than that. And as long as you're within the GAWR, GVWR and hitch ratings, they won't even bat an eyelash if you ever get flagged into a weigh station anyway.

I stopped at a weigh station before heading into the tunnel under Chesapeake Bay for the routine propane bottle inspection and I chatted with the guy there about it. He confirmed that they don't care about rated towing capacity and would only look at the GAWR and GVWR placards, and only if they had obvious safety concerns or I was operating as a commercial vehicle. If I'm within that, I'm good, but RV's don't have to worry about stopping at weigh stations in most states anyway unless there are signs that specifically say so.

Misty Mountain Camp near Charlottesville:
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Drove it to the Earl Scruggs Music Festival in southwestern NC in August and caught Marty Stuart and Jerry Douglas live, among many others we love:
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Did some boondocking with friends out on the James River near Scottville, VA:
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Another trip out to Deltaville, VA:
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And finally, a weekend birthday getaway to Elkton, VA:
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swathdiver

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Decided on these wheels (OEM) from a Silverado 2500 in 18". Smokin' deal at $209/ea.

Haven't driven it hardly at all since the fall - just sitting in the garage waiting for camping season to start.

View attachment 449178
Does your chassis use the old 8 x 6.5 or the 8 x 180 lug pattern?

The GMT900 2500s kept the pre-2011 pattern all through production.
 

adventurenali92

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Really cool truck for sure!! Sounds like a real badass beats for towing! I’m so jealous! I’d love one of these things to tow with! Th ask for sharing the trip photos!! Awesome shots and glad you’re taking it on adventures!
 

Bigburb3500

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Decided on these wheels (OEM) from a Silverado 2500 in 18". Smokin' deal at $209/ea.

Haven't driven it hardly at all since the fall - just sitting in the garage waiting for camping season to start.

View attachment 449178
Can’t wait to see this on the truck! Do you know the weight rating of the rim? I’m looking at wheels too but want to go bronze (against my white truck). Most of the wheels have a weight rating to it but honestly I don’t know how to compare it to a stock/factory wheel?
 
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Geotrash

Geotrash

Dave
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Really cool truck for sure!! Sounds like a real badass beats for towing! I’m so jealous! I’d love one of these things to tow with! Th ask for sharing the trip photos!! Awesome shots and glad you’re taking it on adventures!
Thanks man! I feel lucky to have found it. I literally looked for 3 years for a low mileage LT, and they're unobtanium. I only saw 3 come on the market in that time, and they all sold within a few days. The LS trim level ones are more common and come up for sale fairly frequently.
 
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Geotrash

Geotrash

Dave
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Can’t wait to see this on the truck! Do you know the weight rating of the rim? I’m looking at wheels too but want to go bronze (against my white truck). Most of the wheels have a weight rating to it but honestly I don’t know how to compare it to a stock/factory wheel?
They're actually factory option GM wheels for both the 2500 and 3500 SRW pickups, so I'm sure the weight rating will be appropriate for the Suburban 3500.
 
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Geotrash

Geotrash

Dave
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The wheels are out for delivery about a week early. I'll post up pics once they get here, but in the meantime it's time to order tires. I'd like to keep the same diameter and width as the factory tires, which with the 18" wheels would be 265/65/18. While there is a wide selection for standard load rated tires, there are only all terrain options available for E-rated tires in that size. That actually works out fine because we do a lot of beach driving on the OBX, and modern A/T tires can still be pretty quiet on the highway.

Will probably go with the Falken Wildpeak A/T4W.

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Bigburb3500

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The wheels are out for delivery about a week early. I'll post up pics once they get here, but in the meantime it's time to order tires. I'd like to keep the same diameter and width as the factory tires, which with the 18" wheels would be 265/65/18. While there is a wide selection for standard load rated tires, there are only all terrain options available for E-rated tires in that size. That actually works out fine because we do a lot of beach driving on the OBX, and modern A/T tires can still be pretty quiet on the highway.

Will probably go with the Falken Wildpeak A/T4W.

View attachment 450625
I’ve had these before, the Toyo OpenCounty are much better on the highway and the BFG KO3s are light years ahead. I’m running the KO2 on my Toyota (2rd set) and KO3s on my Burb.
In the end, great tires but if you do sand driving on the Outter Banks:
1) Let me know when you’re going. Might swing by.
2) Our trucks need LOW tire pressure. About 20-25 psi. I struggled this past summer out there with how dry it was and it was like quicksand.
 
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Geotrash

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Dave
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I’ve had these before, the Toyo OpenCounty are much better on the highway and the BFG KO3s are light years ahead. I’m running the KO2 on my Toyota (2rd set) and KO3s on my Burb.
In the end, great tires but if you do sand driving on the Outter Banks:
1) Let me know when you’re going. Might swing by.
2) Our trucks need LOW tire pressure. About 20-25 psi. I struggled this past summer out there with how dry it was and it was like quicksand.
The KO3 was on my list but I had a set of original KO’s on an old Isuzu Rodeo for a long time and they were brutal. All the same, I was willing to give the KO3 a try but they don’t seem to have them in the 265/65/18 size at discount tire - only the KO2, which seems odd. Anyway, that’s why I was looking at the Falken.

By all means, I’ll let you know where we’re headed back to the OBX. We love it there!
 

Bigburb3500

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The KO3 was on my list but I had a set of original KO’s on an old Isuzu Rodeo for a long time and they were brutal. All the same, I was willing to give the KO3 a try but they don’t seem to have them in the 265/65/18 size at discount tire - only the KO2, which seems odd. Anyway, that’s why I was looking at the Falken.

By all means, I’ll let you know where we’re headed back to the OBX. We love it there!
I will also say, I had the previous AT3 (?) Faulkens so there is likely a big difference. I have no experience with the original KOs but the KO3s are leaps and bounds better than the KO2s (both my trucks have E rated tires too). Def looking forward to a review and if we meet up it will be KO3s vs AT4s at the beach! Haha
 
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Geotrash

Geotrash

Dave
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I will also say, I had the previous AT3 (?) Faulkens so there is likely a big difference. I have no experience with the original KOs but the KO3s are leaps and bounds better than the KO2s (both my trucks have E rated tires too).
Thank you for this insight. I'll keep looking around to see if I can find KO3's in the size I need. I have some time because I won't be able to get to any tire shop until the first few days of March.

Def looking forward to a review and if we meet up it will be KO3s vs AT4s at the beach! Haha
If I do end up going with the Falkens, this would make for a great YT video! The guys over on the Suburban/Yukon 2500 FB groups would be thrilled to see a couple of 3500's hooning around on the beach.
 

Bigburb3500

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Thank you for this insight. I'll keep looking around to see if I can find KO3's in the size I need. I have some time because I won't be able to get to any tire shop until the first few days of March.


If I do end up going with the Falkens, this would make for a great YT video! The guys over on the Suburban/Yukon 2500 FB groups would be thrilled to see a couple of 3500's hooning around on the beach.
First one stuck buys first round of beers.
 

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