I'm not 'concerned' so to speak. I just wanted the original poster to make sure he's not scalped at lease turn in time. I've worked in and around the auto industry for over 20 years and I don't at all doubt that he may have been told what he said but I very seriously doubt that will be the case at lease turn in time. Every lender I've spoken with and every major sized dealer I know all say that, at the very minimum, he will have to buy a brand new bed for the truck at lease turn in. Most dealers also said that they would have a very hard time getting any warranty work done to his truck if the factory knew there was a gooseneck hitch in a half ton pickup. If dealers see things that don't belong, like a gooseneck hitch in a 1/2 ton pickup, they are at risk for not getting paid by the factory for the warranty claim if the factory finds out about it and the dealer didn't make it known to them. Most dealers aren't willing to look the other way with the chance they may have to eat the cost of his repair.
In general, both of those things spell major expense for him. I just wanted to point out that what he says doesn't jibe with industry standards, manufacturer standards nor lease company standards. Doesn't mean that 100% he's wrong, but it does mean that he better darn well get everything in writing and probably video tape the dealer telling him that so the dealer can't later say 'that's a forged document' and that he never agreed to such nonsense.
To me, having decades experience in the industry, this sort of smells like someone buying something from you on eBay for $100 and then sending you a check for $2500, asking you to send the rest back to him in cash. There's a chance it's a real deal but the odds are extremely slim that it is.