It's all about payload. Almost always, people run out of payload before they run out of tow rating.
In that size range, you are looking at a pin weight around 3500-4500lb (20-25% is typical). Pin weight counts against the trucks payload. Also, the weight of people and gear in the truck along with bolt on aftermarket items like running boards. You could easily be north of 5000lb in the truck.
- SRW trucks top out around 4500lb payload but that will generally be the gas regular cab. If you get the extended cab diesel (and in that size range, I would want diesel), it will be lower. I won't say it's impossible but very tough to stay within the weight ratings.
- DRW trucks start around 6500lb and go as high as 8000lb payload. That gives you plenty of room on payload.
