I have thought about that specific oppty for a while. Overall, it would violate some of my highest business principles, to wit: No employees; No fixed location. And, the more you touch things, the less money you make. To start such a business from scratch I think would be very cost intensive, but as a “sub-business” within an existing used car joint might be feasible. If you were to really hose out a 20-year old truck and renew the thing to a high level, I think you’d have to get $17K-$20K for such an item. And maybe that would be an acceptable price point....but a used $17K Toyota is likely a better vehicle as is. You’d have to work in CA or NV, or out west, because my Gawd, you look at 2005-2008 Silverados, etc; on YouTube from the midwest and the frames are literally rusted in half. And then you’re starting a business in California, definitely an uphill battle.
Salt on the roads would limit your choices for raw materials.
So you would have to get cars and trucks mainly from the South and Southwest USA...................