I expect that was your collision avoidance system having a hiccup. Mine did that often enough that I finally turned it off. I was afraid the sudden slowdowns would eventually cause an accident.
No TSB, just a random seal failure. Maybe an out of spec part, or maybe damage during assembly, don't know. Warranty covered it and no one else has reported similar, so I guess I just drew the short straw.
Well, not a major 'failure', but still. Took the XL in for an oil change and the tech found oil on the front of the pan area. It was hard to tell from underneath because of the splash guard, but sure enough there was a mist of oil on the passenger side. Turns out the front crank seal is...
I've yet to put in more than one 2.5 gallon jug of DEF between oil changes at 5K. I do not tow with the Yukon, however, so my experience is to just pick up a jug after an oil change and when it's down to 1/2 on the gage I pour it in.
On road trips, I think the standard length is fine for four with luggage. Six with luggage can be a tight fit even for the XL and at seven you really need an external carrier. Even driving around daily by myself, I've never once thought I'd rather have the standard Yukon, but I have plenty...
They are not typically a dealer installed accessory. You may want to read through this:
https://www.tahoeyukonforum.com/threads/2021-tahoe-escalade-yukon-power-running-boards.126705/
The installation I expect is straightforward. The integration with the body control module, maybe not so...
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