IMO there is always a market for lightly used aftermarket car/truck parts that are in good shape. In your case, your wheel/tire set-up and brakes are of high caliper and look to be in good condition. The market for those willing to spend $8-$10K on a nice forged monoblock wheel set-up is very small, additionally you don't see many running around with $8,000 big brake kits. Your challenge will be the difference between what you spent on these parts new and what someone is actually willing to pay.
If you listed the HRE wheel and tire set-up they could probably sell for $3,800-$5,000, even to me that seems low for what you paid. But the market for that caliper of wheel is small and not many appreciate the difference between a forged monoblock wheel vs. a cast wheel, let alone are willing to pay for it.
As far as your Baer Big Brake kit, it'll depend on how many miles are on them and the life left on the pads, but I'd say you could probably sell those for $3,500-$4,000.
I'm just ball parking numbers here since you asked so by no means should you take this as the gospel.
That being said, if you are considering trading the truck in, by all means do not trade it in with the HRE wheel/tire and Baer brake set up. Dealers aren't going to give you any extra on your trade for them. Now if you're plan is to list it as a private sale, sure leave them on, you may find a buyer who wants to buy your truck because these parts are on it, whether he wants to pay extra for them is a different question but can be determined quickly.
