I ran ProComp eXtreme MT's in a 315/70 for about 2 years.
Couple of bitches about them... THEY RUN SMALL mine measured in a a whopping 33.25 mounted. They also chunked unbelievably in the rocks and were a bitch to balance.
Though they did perform well enough in most situations I had them in with no real loss of traction except for deep snow on the trail. Street, they performed well, and milage was pretty good. I have about 60,000 on them and they could have probably gone for another 10k at least.
From what I've read of the Trail Grapplers, I would chose them over the ProCraps.
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