If you travel alot in a RV, you need to take care of the roof on it. Your RV is exposed to different elements due to different areas you may be traveling. The roof is exposed to the sun 90 percent of the time. Over long periods your RV roof will begin to break down, due to the suns UV rays.
You will first need to check the roof of your RV and make sure it can be fixed, or really needs to be replaced. One that is not to damaged can be fixed by you. You surely don't want the RV roof leaking this can cause major damage, causing wood to start rotting in the ceiling. Some things to do to protect your RV roof, are to keep it as clean as possible. It will really help it alot, and it will last longer. Dirt contains acid from pollution and this left on the RV roof will start to cause the rubberized material to crack.
By cleaning your RV roof with a mild soap as armor all car wash, and a soft brush, will clean the residue off. When your cleaning your RV roof make sure you get in the cracks, and the caulking that is around your roof vents, and any skylights you may have. Always be careful walking on your RV roof, making sure you do not step on any fragile plastic skylights.
After you have cleaned the RV roof, and it has dried completely, now you can seal it. You want to apply a silicone base sealer. The best product for this is RV roof cleaner and sealer, like Protect All. When buying it you will want one that has a high silicone content, this will give you the most UV protection.
Remember a good clean and sealed RV roof will last for many years to come.