There are what they call tripod jacks that can be used to lift the camper from the sides. An angle iron catches both sides and then you raise the camper and roll the truck out from under and set on another truck or trailer. If you have an RV dealer around they may have the tripod lifts and rent or loan them to you. Some people use two I perfer at least three jacks. You can also buy jacks and install them to use. ATwoods, Happy jacks, and others.
And one more method if it is not real heavy alot of friends and case of beer. Four or five big guys on each side, take it off and set on a trailer.
'03 F350 DRW 6.0 auto
2003 A990S Arctic Fox