For a shortbed a slider hitch is highly recommended. This is especially true for older trailers with flat front caps rather than the newer rounded caps. It will save you from a smashed truck cab and damaged trailer when making sharp turns especially when backing.
A manual slider hitch is normally in the forward towing position. If you turn sharp the trailer may still hit the cab. Generally such turns only occur when backing and thus the manual slider is moved to the rear position once you get to camp and need to back into your spot.
An automatic slider hitch moves from front to rear automatically as your truck is turned. There is no need to manually move anything. The only readily available auto slider hitch I'm aware of is the Pullrite Superglide. It is more expensive than a manual slider but to me is well worth it. One advantage of the superglide is the ability to easily completely remove the hitch from the bed by pulling a few pins and lift it out when you need to use your truck bed when not towing. Most other hitches require substantial time to remove and then reinstall later.
No matter which hitch you select try to find a local shop that specializes in hitches rather than buy from an RV dealer. I find hitch shops have better pricing and better skilled techs that get you what you need and do it right.