I agree as I have run mine for long periods of time with the door closed with no issues, including at race tracks, etc. It was fine before we left for this trip because I changed the oil in it and would have noticed the door then. On this trip, I have run it for 2-3 hours at a time and the only difference is the truck was still connected. I noticed it looked like it had a slight warp in the exterior appearance and then when I opened the door, I saw it all wrinkled up on that one side on the inside of the door. It does get very hot in there when it is running,though.
