My husband and I may possibly be getting a 1948 Chevy 1 Ton flatbed truck and converting it to a diesel.  The truck's frame is in perfect condition and we think it might even run (we'll find that out soon) but of course it will still need some restoration.  Currently this truck has a two speed rear axel and 4 speed manual transmission and the original motor.  Otherwise it's in impeccable condition for it's age. To view an image of what we plan on restoring it to just go to: http://www.oldchevytruck.com/trucks3/s.htm

We haven't gotten a fifth wheel camper yet (because the house needs to sell first) but we really like and plan to get a HitchHiker or Champagne that's at least a 35' and use the above truck to haul it.

Does anyone have any concerns or suggestions with using this pickup as a hauler for a large fifth wheel?

That looks really cool to an old car/truck guy but I'm not sure it would work without extensive renovation.Most modern 1 tons would be close to capacity with either 5ver.You could put a diesel in it and have plenty of power but will the rest of the drivetrain hold up or do you plan on transplanting newer stuff to the truck.You would need a modern braking system also because stopping is as important as going.
       It would be really nice if you could make it work and you can but are your pockets deep enough for the expense? Good luck, I hope you can do as planned.

I think Racerguy is hitting it right on the head, a truck from 1948 isn't going to have any of the systems and components able to handle the loads of a modern 1 ton truck. Can't imagine it would be very comfortable either. Good luck, Fred