I would second the jack and cribbing. IF you stack everything up securely you can lift it very safely using this method. You can also work on the bed while it is raised and when you are done with the truck and the bed you can simply lower it back down. Just take it slow and plan ahead and you'll be fine.

Tad


1946 Chevy OS 1.5ton, 1955 GMC 3100, along with other various IH,Ford,Nash,MGB,.....