it wont help the crack, but an idea for after its been repaired...when i converted from 8x165 to 8x170 i modified the backing plate on my tire carrier so that the tire was actually resting on the back bumper instead of the entire weight of a 17x9 rim and a 35" tire hanging off the back of the tire carrier. its a lot easier to get back on the lug studs that way too. rest it on the bumper then fandangle it back onto the studs. way easier on my worthless back.
"understeer is when you hit the wall with the front of your car, oversteer is when you hit the wall with the rear of your car, horsepower is how hard your car hits the wall, and torque is how far your car moves the wall."