New Owner of an Used (1990) RV here-What do I need to know?

Find out how many leaks you really have and address them. How, you ask? Pressurize the coach and spray soapy water on all the seams from the outside. If there are no bubbles, you are ready to hit the road! If you see bubbles, you have a leak.! I just did this to my coach and found two leaks that I was not aware of. Water is your enemy! Do a pressure test every six months and you'll be fine! Or, you can go to an RV repair center and they will charge you $$$$ to find the leak(s) for you.