I have a swivel arm lift that bolts into the bed of a pickup for sale. Got it at Harbor Frieght. Don't have the truck it was mounted in anymore. Works good for lifting heavy loads into and out of your truck. I picked up a 292 Ford engine with it and swung it into the bed as easy as pie. It swivels at the base and has a bottle jack to lift the arm.

Email me for price and a pic of the thing. It is in OKC.