dls0008, I agree that there is nothing that is going to feel similar to a truck camper. AFAIK, a TC would be covered by the truck insurance. FWIW, I have test driven Class A RVs and bought one. I also bought a TT on condition that the towing was ok.
Seems to be a lot of guesses on what dealers should do with all of the responsibility on the unknowing new owner. If you think about how people constantly complain that some dealers will sell newbies anything, I think that's almost a requirement that any purchase would be on condition of a reasonable/safe ride. That's assuming the potential owner properly prepares their truck.
I know in my area, it is common for TCs to be moved to shows etc on the back of a truck, so it's like the TCs would be used after being loaded.
YMMV along with opinions, I guess. :)