Here's the budget version slider hitch. Reese 16k Kwik Slide. Instead of being automatic like Walt's. This requires you to pull the handle. You then hold the trailer brakes and gently pull forward. This slides the hitch back in the bed to give you another 12-14"of clearance whenever you need it.
4 pins hold the hitch to the rails installed in the bed. Pulling the pins and removing the hitch leaves 2 rails in the bed that are almost flat and really don't get in the way. Some people cover them with a bed mat.
The upside to this type of hitch is price $500-650. The downside is having to manually operate it and the rails remaining in the bed.