The Reese Revolution is a better and cheaper solution than a sliding hitch, especially if included as a factory option on Flagstaff and Rockwood fivers, maybe others as well. A short bed truck with a slider or Revolution, even if it can't quite make 90 degrees will still turn plenty. Never had a slider on my 1/2 ton trucks. Installed one on the 3/4 ton just in case I bought a fiver with a straight drop pin box, but never used it. With today's notched front caps and extended pin boxes, it isn't needed on a 6.5ft bed, and the Revolution is the best answer for a 1/2 ton with a 5.5ft bed.
It doesn't matter if 99% of fivers on the market can't be safely towed by a 1/2 ton, there is only one fiver that matters, the one you buy. I spent 15 years towing three different fifth wheels with several 1/2 ton short bed trucks. Towed many miles and never felt unsafe, my preference and opinion, it is safer to tow a fiver at 95% of the tow vehicle ratings than a TT at 80% of the ratings. More stable, less driver fatigue, no hassle getting the correct hitch setup.