[wiredgeorge]

The roof penetrations are sealed with self leveling Dicor and this stuff tends to crack over time and need some resealing. Most folk don't try and remove the old Dicor but clean it and put new over the old especially where there are cracks. The stuff comes in a tube that you need to use a caulk gun with so you will eventually need to get up on top. The sides of the roof use NON self leveling Dicor. This is used as the the leveling product will run when in the hot sun and make a mess. Folks also clean their roof now and again per manufacturer's directions that come in your trailer's packet. Last, cleaning the cooling fins on the A/C up top is a good idea now and again. Frequency depends on environment and use. I am pretty sure there are youtube videos detailing this and the touching up of the Dicor reapplication.