My 2004 2500 Laramie Quad Cab has twice had a bad water leak in the cab. The situation is that the truck was parked at a nose-up incline for two severe rain storms. The carpets were soaked and there was standing water in the storage compartments under the rear seat. Moisture must have wicked from back to front because the front carpet was dry. The inside wall of the back of the cab had moisture (behind the back seat). The first time this happened I suspected the cargo lamp assembly, cuz you may have noticed that the shape of the plastic is a poor fit to the body here, and the gasket seemed shot. I removed the assembly and sealed the heck out of it, sprayed it with hose, and got no moisture inside. I was then surprised by the second time it leaked under the same circumstances. Any thoughts on other places of the cabin that are not water tight? Could it be the sliding rear window? Is there something special to parking it at an angle that is allowing rain to get in? I was going to buy one of those cab covers from Geno's but wanted to hear other opinions about a genuine fix.