Re: Rim backspacing question
Never heard of a wheel with those specs. Are they a 10" rim, or did the guy measure 9.8" which would indicate a 9" wide wheel (measured in the bead area). If they are 9" rims with 4.81" backspace then the offset is around 0 to +6mm which should fit like a stock wheel. Depending on how aggressive the tread is, you may have slight rubbing on the springs at full lock.
2012 F-150 XLT Ecoboost SuperCrew 6.5' 4x4