Thanks for the replies. Our Trail-lite is a 2007 model. It has the battery compartment. We spotted that some rubber around the slideout at the bottom of the passenger side was missing. It was pouring rain the day we went to see it. The water showed the leak.
We go on Friday to pick up our unit. It is almost 100 miles from our home to the dealer. Next week the dealer is moving, so if anything goes wrong with the motorhome, then we have to travel an extra 60 miles for repairs. All good back roads to get there.