Each one of the Dreadnoks had a certain niche they filled in the gang and Road Pigs niche was to be the ugly one. Or possibly the smelly one. Or maybe the big one.
OK, maybe Road Pig is an exception.
I can't say for sure, but I'm just about convinced that the Reaper Miniatures Mega-Mutant is based off Road Pig. He's got the big hammer, the wrist crossbow, the weird shoulder armor. Even the boots look similar. All I had to do was add a flat top and a ball at the end of the crossbow and he was done.
On a side note, since this is a metal miniature, he's HEAVY. He is prone to tipping over, which might also be similar to Road Pip.