Do the following steps if you find that the lift ramp is rubbing against your panel assembly or that your short rollers are missing the ramp.
Loosen the nut one turn that is holding the static ramp to your cab mounting bracket.
Push or pull against the ramp just under the rail until you have roughly 1/8" gap between lift ramp and panel. When you have the appropriate gap, re-tighten the nut loosened in the previous step to secure the ramp in place.
Pull the panels towards the ramp to see where the short rollers are in relation to the center of the ramp leg. Pull or push at the bottom of the ramp until the short roller makes full contact and is riding at the center of the ramp.