We regularly heard RV salesmen telling us to plan for a loaded trailer to weigh 1,000 lbs more than the dry weight.
Obviously a small trailer going on a weekend trip for two will carry less than a large trailer full timing a family of four. Also a smaller trailer will have smaller capacities for water, waste, LP, food, clothes...
Plan on 800 to 1200 lbs, depending on the length of the trailer.
For any given size Airstream most owners are going to be traveling within a few hundred pounds of one another, and the tow vehicle will never know the difference.
Where you put that load is more important. Best to keep the heavy stuff near the axles and the light stuff at the ends for stability.
With 1400 lb w.d. bars, our heavily loaded Airstream adds about 800 lbs to the truck's load when hooked up and w.d. set. The truck's axles are carrying near equal loads. The driving and handling is like there is no trailer behind.
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