I recently got a set of 12 bolt hummer rims with rubber run flats. I am looking to recenter them and was wondering everyone's opinions. Where should I get my new centers? I like the fact that the USA6x6 ones are "pressed", but how much does that really matter? My truck will see the highway some. Should I send them off to be recentered or just buy the centers and have them done locally at a machine shop? How necessary are rock rings (like the ones Diy4x sells)? Do H1 wheels bend easily? How much backspacing would you recommend? I'm going to run 39.5x15x16.5 TSL's on 6" of lift. I would like to keep from moving the axle forward if possible. Is this possible without moving the axle? And finally, should I run the rubber runflats? I won't have a spare for a while, plus they're already there. A lot of questions, I know. Thanks in advance.