Originally Posted by harold1946
Had the same problem with the trunk gasket and filled the holes in the rivets with rtv. With both sides of the trunk being rusted I would suspect the joint between the end cap and main roof. Seems to be a common place for leaks on many motorhomes.
I found junction of endcap, and floor trim had been caulked by po, material used had dried and lost sealing ability.
We had a second rain after fixing rivets, not fixed, couldn't figure out why it was wet just in the center, only thing left was the third brakelight, probed with a knife blade and found the problem, hole was cut too big and foam gasket had disintergrated.