I learned this trick on the net. The ceiling/headliner panels are sometimes hard to remove and install because the roof ribs have sagged. They will sometimes be sitting right on top of the cabinet modules. Especially the rib over the generator start switch. Using a 2x2 or a 2x4 with a piece of wood top and bottom. Cut the 2x4 or 2x2 longer than the distant between the roof and floor. This will allow you to \"kick\" the 2x4 that is close to the floor and will raise the roof rib. Once you get the 1st headliner panel out you can then use the 2x4 technique as you move to the next ceiling panel or as you start to install headliner panels. I think it would be best to push up where the ribs intersect with the cross members. You move the 2x4s forward of each section your installing. If you find you have this problem it would be best to start the installation from the back to the front.
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