Ran into this issue with the Liberty last summer trying to change out the front brakes. Got all off except for one and me being the stubborn person I am managed to completely mangle it and had to take it to a shop. Had I had an impact at the time I would have probably been ok. Replaced them with some Dorman (ugh) solid piece nuts, but after one winter barely driven in salt they're looking pretty ugly. Also had this issue on the Tacoma, but this time I have an air impact and was able to get them off. I was going to replace all with new solid nuts as well, but the guy who sold me the low mile take off wheel/tires gave me the old nuts that are in much better shape. We'll see as time goes by. The Camry has the same exact nuts so I'm keeping a close eye on them as well...