I have a '97 16k square tube slider by Reese. The hitch has been on three trucks and two different 5th wheel trailers and still work like a hot knife through butter ( I keep it lubed and maintained). The sliding part is seldom used other than backing in extra tight conditions. The manual slider moves the pin 10" aft of the trucks rear axle which makes the trailer react quicker to steering input.
I'm not a brand cheer leader and there are other sliding hitch brands out here. My advise is make sure the hitch pivots four ways.
Many short bed GM owners report they don't need a sliding hitch or they don't have one. The GM trucks have a longer dimension from the back of the cab to the trucks rear axle. This along with the newer 5ers with a notched/rounded front corners make a sliding hitch not necessary. Your trailer dealer/manufacturer can help you with that part.