On a Tiffin, to access the retainer screw, you MUST remove the vertical painted trim on the outside. There are only about 6 or seven screws. remove them use a razor knife to cut the silicone sealed edge and remove the trim. You then look at the upper rubber seal and you will see a small hole and insert screwdriver and unscrew. You have to do BOTH front and rear. IF you have access to 3 or 4 people, just unplug both motors from the slide controller and once this is done, you can manually push the room in. It is hard but can be done. Have 2 outside and 2 inside Pushing outside and pulling inside. Doug
PS, you HAVE to remove that retainer screw from the outside. That screw keeps the motor from lifting up. Also, on a Tiffin, the motor only removes from the INSIDE.