Do the following steps if your find the the lift ramp is rubbing against your panel assembly or that your short rollers are missing the ramp.
Loosen the nut located on the kickstand behind the ramp one turn.
Push or pull against the ramp just under the rail until you have roughly 1/8" gap between the lift ramp and panel. Then you have the appropriate gap, slide the kickstand out until it makes contact with your bed wall and re-tighten the nut.
Pull the panels toward the ramp to make sure the rollers are riding up the center of the ramp. If adjustment is needed, apply pressure against the ramp where the bolt is located and then push or pull on the bottom of the ramp leg to adjust the ramp.