Check the payload of any truck you are looking at. At 7200 GVW (if you are looking at the trailer dry weight, don't), a 5th wheel pin weight could be 1500 lbs. For a lot of 1/2 tons, that will exceed their payload. Remember to add the weight of the 5th wheel hitch as well as people.
Also, be wary of jumping to a 3/4 ton diesel. Payload on some of them is barely 2000 lbs (the same as my half ton). And while I do think a 3/4 ton diesel will tow better than my half ton, if both within limits, I'd not want to move to a 3/4 ton and be disappointed in the payload. Gas 3/4 ton typically have 500 or so more payload than a diesel comparably equipped.
New trucks, like the 2020 GMC HD, have thrown this out the window.