Rolling frame won't roll anymore

[cypressbog]

A bunch of years ago I stored a 1 ton rollong frame with a good bed on the back outdoors with the intention of "doing something with it in the future". Well I am losing storage and jacked it up to put some rims and tires on it that hold air. I noticed I can't turn either front or rear tires (Ho-72 Rear and Disc Front).

What should I try to get the truck rolling? The frame is a factory 9 foot C-30 stepside. I was thinking about cutting the front end off and making a truck bed trailer out of the thing but worried the rear end might be scrap now. Could it be the drum brakes are froze up? Would several cans of PB Blaster work?