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Okay...I am working on a 56 f-100 and the running boards as well as the bed are attached by rusted bolts with round tops. I tried everything but since the running boards are good I wanted to keep them...so no torching to warp metal or destroy them.
So....I went to Sears, got a cutting metal kit for my Dremmel and worked on the top of the round bolt head...not the nut. I sliced a slot on the top right down the middle. Then I could use a large slotted screwdriver in the bolt and a ratchet underneath. They came off in no time. If one was particularily stuck I just drilled a cross slot and knocked the top head off all together. Viloa!!!