The following information will show how to level a rail out on a Limited HDX Edition bed cover that is a direct mount (not clamps). We recommend placing the spacer on on the tailgate end brackets only.
*Spacer is available by contacting support@peragon.com
Rail Alignment
Your rails need to be narrowed as much as possible at the tailgate end. If your rails are not touching the rear roller on the tailgate panel then your rails are too wide. You can view Panel and Frame Adjustment at the 12:55-13:22 time mark in the video below to see how to push in the rails and then center at the tailgate end.
You will need to loosen the tailgate end mounting brackets to do this adjustment in order to push the rails in.