I haul my Bigfoot 25C9. 5 (3217 lbs wet and loaded) and tow my Wells Cargo toy hauler (6300 lbs) and until last year I did it with my '01. 5 2500 QC LWB and would provide the following comments;
- You are going to be way over GVWR, so be smart about it. Keep the camper weight as low as possible. This means no basements, no slides, etc. I would suggest a lightweight 8. 5' camper with bathroom. In addition you are going to have at least 1,000 lbs tongue weight, so if you can tow without a hitch extension, you will be much happier. Anything over 8. 5' long will require a hitch extension and a change to a "class V" hitch.
- don't go by the manufacturer's listed dry weight. They lie.
- Use weight distributing bars.
- Prep the truck for the load. Airbags will help keep things level, but sway control will be your primary issue. Load range E tires aired to 80psi are the way to go. Consider a set of Rancho 9000's set on level 9 for the rear. Personally, I went with a custom set of 5 leaf overloads for better sway control, but then I wasn't concerned about a harsher partially loaded ride.
With my camper and trailer, my truck was at approx. 11,500 lbs GVWR and with the above set-up it worked alright. I went on a trip from B. C. to halfway down Baja and experienced everything from 75mph highway drives to some fairly brutal gravel roads in Mexico. Ultimately I decided that 11,500 lbs was too much for my 2500 and I bought my DRW. The stability of the stock dually is far superior to the moddified SRW truck. I strongly suggest you try to keep your loaded camper weight under 2500 lbs, which means a dry camper weight of no more than 2000 lbs.
Hope this helps,
Dave