I've gotten stuck in mud with them, but not without putting up a hell of a fight. These things impress the hell out of me in 2wd on the snow. I think maybe cause they are really new and what not but they have been great. I haven't gotten a chance to air down, but at 30 lbs they still impress me in 2wd and 4wd is a whole nother story. I will say I know they are digging by how dirty my rig has been. I was in 2wd and the lugs threw an incredible about of mud on my hood and that was just going to get a christmas tree, no boggin.