The GVWR before 2005 was only around 8,800 pounds for a F-250. Your truck curb weight is probably close to 7,000 pounds, leaving only about 1,800 pounds for cargo, the 150 pound hitch, and passengers.
No - not even a SRW F-350 of the model year 2000 would have enough cargo rating with it's 9,900 pound GVWR. The rear axle is only rated at 6,000 pounds due to the 16" rims and their 3,042 pound weight rating.
Sure changing to 19.5" rims will take away that problem, but will not provide the super duty brakes used on the 2011 model that has a 10,000 + pound GVWR and 17" or 18" rims and tires rated at over 3,400 pounds each.
I would trade up to a dually for sure, and 2011 or later model if you can afford it.
The 2000 model year F-250 would be at least 3,000 pounds over it's GVWR when ready to travel, with a 1/2 full fresh water tank, normal amount of camping gear and clothing, food, ect. Add a generator to the pickup, and you are just going further over the recommended GVWR. The rear axle will wallow around because the tires are not rated at that much weight, and are to soft. Changing to all steel sidewall tires might help things out a bit, but still you will be much better off with the dually with a DRV product.
Good luck,
Fred.
