Has anyone had problems with thier wheel studs keep loosening up? This problem has caused the holes for the studs on the rim to become oblong and ripping the metel on the rim. I called my dealer to see if anyone has had this problem and they said yes that there is a bullitin up on it but no recall. they said just keep tightening them. I then called walker and they told me there has been some complaints but no fix or reason for the problem. I now have to buy new rims but i don't want this to happen again. I have tried loc tight and it still loosens. The bolts aren't stripped either. Also thinking about buying another walker any suggestions on which engine to get?