Condensate running off the roof is normal. The answer is to keep your tailer tilted a bit to facilitate the runoff, as previously mentioned. However, lots of water could indicate a problem, such as a low spot in the roof. Level the trailer and run water from a hose on the roof. Then get up on a ladder and take a look. You should not have "pools" of water on the roof. You probably don't have a problem, but why worry about it?
Happy Camping! ///// Richard D.
2006 4x4 Ford 250 SD / 2007 Flagstaff 827 FLS
One very patient wife and one furry child who travels with us. Forty-two years of trailering and camping, and I still have a blast.