I mounted one today in the front (all I had time for). Will definitely need to pull the fenders and a little camber, but nothing too outrageous. The rear should be a lot easier
The weights on next level's website seem to be pretty accurate. As I recall, my wheel was supposed to weigh in at 21.5 lbs, so it's prolly safe to assume that the weights for the other sizes is pretty spot on.
Got the tires mounted up, I'm pretty happy with the amount of stretch (not too much). Got about 1.75° of camber dialed in and it sits pretty flush with the fender. Just need to pull it a bit and it should sit really nicely. I'll post pics in a bit.