305/60/18

According to West KY customs this combo fits a stock Dodge ram. Anybody doing this already on a 4th gen? Pics? That's a 12.25 wide x 32.5 high tire. The rim is a 18x9 with +0mm offset. Which makes me wonder as they are also saying you can't fit that same tire on a 18x9 rim with -12mm offset...