Prevent ceiling damage around roof vents
Here is what I did in my 1989 toyota seabreeze to prevent ceiling damage around roof vents and A/C unit. I am not sure how newer rigs are made, but the openings cut in my Yoda's roof were left raw wood...any water that leaked in around vents or A/C seeped into the raw edge of the luan ceiling panals. By sealing up the raw wood with 3 coats of paint and drilling weep holes in the corners of vent trims, any leakage will drip out the weep holes and be spotted immeadiately. Some pics.