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I think that most 3/4 tons and 1 tons all have E rated tires. Now some are 20" which I think have slightly lower numbers, but they should all be around at least 3000 lbs each tire which covers the maximum capacity of single rear wheel light duty trucks. Once you go to the level of F450s and F550, they have 19.5 inch G rated tires (and of course are dual rear wheels.
Before we deciding to go with a fifth wheel and buy the dually, we were wanting to upsize our TT (Rockwood 2603) and was trying to figure out the towing capacity of my 1992 F150. I had plans on pulling the engine and building it for lots of torque and doing a few other mods. But I quickly realized that it was limited to a certain towing capacity no matter what I did EXCEPT for going with 4.10 gear (which I had plans for anyway). The body style made a little difference because of weight and so did the engine size because of power. But once those were determined, the only thing that changed the towing capacity was gear ratio with a maximum of 4.10.
Once we decided on a fifth wheel, I only wanted a single wheel preferably a F250. But I would have been very close if not over the payload capacity. With a F350, I would have been fine until adding the washer/dryer and 280 pounds of Onan in the front, plus everything loaded in the basement. Then I would have probably wanted to add air bags to help the squat, but probably would have still had a some sway from the single tires so that is why we went dually. Its funny how things grow once we get started!! Haha.
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