Ok. We were blessed to get a 2001 Palomino Mustang for $1. My father-in-law's coworker, the original owner, was getting rid of it, and wanted it to go to a handy family that would enjoy it. Because, after 12 years, the AC leak and the canvas leaked, he just bought a new one. Here it is with my TV the first time I opened it up. So, I did the basic repairs like checking all of the appliances...the furnace, the water heater, the water tank, the AC/Heater, the refrigerator, the sink, the LP gas. I repacked the bearings, straightened out the dented bumper, re-caulked all of the exterior joints, replaced some light bulbs, and got ready to check the ceiling and the AC leak. Before I got to the hard roof, I determined that the canvas leaks were due to cracks and found a great product...a $7 tube of glue that fixed all of the leaks. Here is what I found when I removed the inside cover of the AC. When I finally went to pull the top off, it had sunk into the roof so bad, I couldn't even apply pressure to break the gasket. The last shop to "repair" the roof leak had used a silicone caulk on the gasket and it would not separate from the roof. I had to use a hack saw blade out of the saw to get the roof up. The roof membrane was cracked and torn from the previous removal and my removal...I am sure that is part of the leaking problem. I was a little intimidated about the damage, but figured I would just jump right in and began tearing out the old, wet wood. One cross beam was so wet that I could ring water out of the wood with my hands. And rotten...let me tell you it stunk. I was afraid to do too much roof at once because I was doing this from the inside. There is one steel u-channel that runs from side wall to sidewall down the middle of the roof. I did one side first and got all the rotten wood out. Not too bad I guess. Cutting out the wood beams mid point across the roof wasn't easy. I did put one hole into the roof membrane, but I used my RV caulk to cover it with a silver dollar sized patch. It was really just a crack in the roof. After all the wet and rotten wood/ insulation was removed, I started to rebuild the structure and replace the Styrofoam insulation. New main beams under the AC. I used a finish grade, 1/4" plywood to cover and replace the old finished ceiling. 1) It was the cheapest sheet product. 2) I know it will add some structural support to the roof. 3) I figured it would hold any hanging accessories we may want in the future. 4) It was about the thinnest thing I could find for the weight. 5) We knew we wanted to paint the ceiling anyway. The Plywood was flexible enough to bend over and around the braces I used connecting the main beams. I finished putting back the wood structure and insulation and was ready to finish the first half of the roof. The first half complete! The 2nd half had almost no water damage and I simply removed everything attached to the roof and installed the plywood directly over the old roof. Here it is with everything put back. We then primed and painted the wood a light blue while leaving all of the trim and metal pieces the glossy white. It is a great looking ceiling and feels warm and inviting. Here I used scraps of the plywood to move the AC, with a new gasket, into place. My DW and DD were able to help me lift it onto the roof, but I had to move it into position myself. The inside...you can see the blue ceiling. Here you can see the painted ceiling, the new valance and new curtains my wife made. Plus the new cushion covers she made and the faux finish she put on the table. Today, prepped and painted most of the frame. I don't have the finished pictures of that yet, but I will get them up soon. This is all still a work in progress. Our first trip will be before school starts so we are trying to Glamp up the trailer before we go. I will keep you posted. I can certainly say we are blessed. The damage was minor overall for the price...we are still in shock at how good a shape it is in.