I bought a 2+2 a few months ago and it needs new rear tires. It has 245-45-16 all around. I know that OE tire size is 225-50-16 but is it ok to run the 245-45s on the original wheels? The main reason I ask is because they wore out very unevenly(in the middle) is that because of incorrect tire pressure and does the fact the I live in the Arizona desert have a lot to do with it? Thanks guys.