i may have nothing to contribute here except a stinky body part...or opinion...whichever
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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...but at first blush they look like a good tire. all these tires are radials...this and the bfg both have three sidewall plies...both have aggressive sidewall traction which will aid traction when you air down...not much setting them apart.
differences appear to be--
the bfg looks like it will be more effective aired down as the corner and upper sidewall profile is more aggressive than the procomp. the bfg also has a rim protector--it is handy, i have "used" (abused?) this feature on my a/t. having no sipes, the bfg m/t is ripe for siping and grooving...you could easily microsipe the center section of the two inner lug stripes without interference from factory siping.
the procomp has factory siping, so it will be very much an improvement over the unsiped bfg m/t. it can also be studded...but you live in arizona. i'm inclined to believe an earlier comment regarding short tread life since a soft tread, sipes and stud holes make for a very good snow tire...or a good tire in the rocks.
personally, i'd get the procomps if i expected to spend most of my time driving on the road, but wanted a tire that could easily run in the dirt. it looks like it will have better road manners and hookup in wet weather than the bfg m/t. if i'd be in the dirt and rocks with the truck--scott's truck for example--i'd get the bfg m/t or similar (longhorns, etc) and a siping/grooving tool and cut some rubber. if you look at the tread patterns on the majority of offroad specific, bias ply, large void tires (almost everything by interco, for example), the lugs beg for grooving and siping, and perform best with a little of both...same with bfg's baja a/t, a radial tire like what you're comparing.
if it's a dd tire or "dual sport" (can i use that term to describe truck tires?) and i didn't want to mess with it (siping or grooving), i'd take the procomp over the competition's m/t...looks like it'll hook up better straight out of the box.
if you need a tire specifically for the dirt/rocks/mud, interco does make radial versions of the sx and the radial trxus m/t, which does have more siping out of the box than any other mud tire, but has a wider section than comparable diameters.
-sean