I like the bfgs better in the mud. One place I didn't really care for the km2s are the sand though. I haven't had the new tires in the snow yet but I so know the duratracs sure were nice!
Just a regular welding regulator but I was talking to a buddy the other day about my co2 setup and he said he runs the poly performance regulator it's like $40 bucks and it's a fixed regulator and puts out a lot of psi. Mine doesn't have that much pressure that's why I might switch to the poly one
It's been years since I had one, but it was a powertank brand. There are several nowadays that all seem alright, including the poly one you mentioned. After using them a while I got tired of paying to have it refilled, so I bought a 12 volt compressor instead.