If you have been upkeeping with the care and maintenance on your 18K Demco Hijacker Autoslide # DM8550034 it sounds like you might need to mess with the gear adjustment bolt located on the cab-end of the Hijacker.
To do this you need to place the hitch in a parallel position with the truck and then use a 1-1/8" wrench to loosen the nut and then tighten it until it stops against the gear. Then simply back the bolt off 1/8 turn and retighten the jam nut to keep everything secure. I'm attaching... view full answer...