As someone who carries a golf cart in the bed of my truck while towing, you don't need a 1 ton for that. The golf cart weighs in right at 1,000 LBS. You can carry it in the bed of a 1/2, but if you are going to tow, I'd recommend the 3/4 ton. Most hitch set ups can't or aren't set up to distribute enough of the tongue weight to the front axle to level the truck and trailer with the golf cart in the bed. The same holds true for some of the larger motorcycles and ATVs.
The only time I can see a need for a one ton truck is, as you say, for a slide in camper or for a 5th wheel or similar goose neck trailer that puts a lot of weight in the bed of the truck. Airstream and Argosy made a few 5th wheel trailers several years back, but other than those, you really don't need a one ton to tow anything that Airstream makes or has made.
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