I just purchased a 21 year old 5th wheel to perm park at my little camp spot. First project is going to be resealing the roof. The previous ower had a leak. Its fixed now but he used black goopy roof tar or whatever on the seams. #1: Should I just use that stuff on the whole thing or should I go with the good stuff from Menards thats made specifically for EPDM roofing. The next question is should I keep doing the tar stuff on the seams or will the Menards stuff bond to the tar? #2: How much propane will the fridge use in a day? #3: Please explain the winterizing process #4: If I replace the crappy built in tapedeck radio with an actual car unit, how much more battery power is it going to draw? #5. I see people with nicer units have an indoor battery meter. How much are they and how hard to hook up? Any other info a newbie could use will be much appreciated!