Polyurethane bushing worries?

[nico]

I recently acquired my dad's old 1984 SWB Silverado and am planning a full resto-mod for this winter... When I received it, there is little more than the cab bolted to the frame, the bed sitting on the frame and all other sheet metal in the bed.

Since the body is nearly removed as is, I am wondering what bushings I should use... Polyurethane or rubber? What brands have other board members had good luck with? Prothane vs. Energy Suspensions?

I have heard horror stories of welds breaking and glass cracking when poly bushing have been used for many miles... Are these true? Is rubber necessary to allow the truck to bend and not break?

Any suggestions?