I've run the 42s for about a month. I did some commuting, a camping trip, drove on the beach, got emissions tested with them, and got quite a few smiles.
We put one on the back first because I figured that would be my tightest constraint and when it fit Zach said that there wasn't any other option but to put them all on. Here are the pics from that shoe fitting.
At ride height rear.
At ride height front.
Zach's rims are not as backspaced as my H2 rims are so they stick out a little more.
Found a little rock to do a minor flex test. The rear is just touching my bump stop as the tire touches the fender. On a harder flex I believe the tire would be into the fender.
Front has more room. Tested turning and because of the shallower backspacing they don't rub on my leaf springs. If I were really stuffing and turning I'd probably be into the front part of my fender well.
Not a big rock when playing around with these large monsters.
Realistically these are just too big for my set up. I didn't build the rig with 42s in mind so clearances are tight and gearing isn't ideal. All my temperatures were up, acceleration reduced, and braking extended. The 4bt with compounds pulled them anyways and I still didn't have a problem getting on the freeway. The rpms at higher speed obviously dropped so that was nice and I didn't notice a big hit in mileage either. I did drive a little more carefully.
I did find that these pitbulls do hum pretty good on the road. You can feel the large lugs at slow speeds hit the road but at the same time the tires are smooth. My nervous handling reduced so that tells me it's the wear on my old tires that are contributing to that. These pitbulls felt confident on the road and in the twisty mountains. They are a little more numb on feedback and at higher speed I think the softer compound on hot roadways does squirm just a little. Daily driver... probably not. Weekend warrior... better suited. The amount of sneak peaks, neck jerks and drool I saw from guy's mouth when my wife drove the truck was at a new level. Only one old man so far has given us the look of distaste and confusion.
I've got a County Fair this weekend that I'll be showing off my rig at and then the following week I'll swap back to my little shoes. It's been fun and it's now got me looking at 40s for future tire replacement sizes.