In low gear, and low in the rear if it is a two speed, That has a pretty good chance of getting it to move. If it is still stuck and the other wheel only spins you may need to chain the back of the truck to a tree, jack up the offending wheel, and put some weight over the other wheel, and try again.
Also try it a bit in reverse, sometimes that will break loose easier than forward.
Someone else may have a simple clever idea, but that's what I would try first.
Grigg
