Yeah, Mark, it's amazing how light they can make some of the travel trailers. My 32' 5th wheel was aluminum frame and pretty light, but the manufacturers know that the RVers are going to load them up. By the time I put the optional generator, washer/dryer, air-conditioner, filled water tank, etc. it wasn't quite so light anymore. However, I was still only running 2,000 pounds on the pin and 7,300 on the axles. When I first got it, I had a 1 ton, single rear wheels, 350 engine, and 3.73 rear end; not bad, but not great either. It was a pleasure to drive, though, with the 1-ton dually, extended cab, 454 and 4.10 rear end, especially with the Gear Vendors (and after I replaced the 3,500 pound axles under the trailer with 5,000 pound axles, radial tires, and bigger brakes).
Gordon may know more than I, but I always guessed that about 75% of the travel trailers on the road are running over the GCVWR of the towing vehicle (and I wasn't one of them).
Bird