I started noticing wet spots under the driverside skirt. At first thought it was water that pools on lower outside shower door rim. But yesterday after wiping water off saw drop coming from screw on skirt bottom moulding. Pulled screw and a lot more water came out. Went to dealer who looked all over even roof. He replaced cauking around outside shower door. Just when done I noticed passenger side was leaking is same spot. Camper at this time was indoors, possible water on that side had just then thawed out. Now this is a 2009 1055 that I got in July. Had to have bumper replaced as it was damaged some how in delivery. Bumper job done a month ago. All cauking looks good cannot figure were water can be getting in. Truck sits slanted forward in driveway so rear is higher then frount. Also have not been on road in weeks but it has rained pretty hard couple of days ago. Any ideas.

Since I had rot already set in, I was left with no choice but to remove and rebuild the skirt. Not a job I would recommend. There are two metal trims on my skirt - an inner and an outer that overlap. When I removed the outer I saw fine dirt had accumulated at the lowest part of the skirt. When I removed the inner, additional dirt and the origin of the rot was very evident. Since these pieces were neither sealed to each other nor was the inner sealed to the skirt, any tire splash would accumulate and as you said had no way out. I sealed both skirts similar to the photo and have my fingers crossed. I agree that bumper gaps should definitely be sealed as well. I suspected another source for my water and this was around an access panel or patch that wasn't sealed. I don't know but what this may have been a repair facility trying to gain access to the holding tank inlets, and maybe not a Lance panel, but either way I corrected the potential leakage source.

Good luck

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Can't say for sure on the newer units but we have a '94 990 and that is the only place where I've experienced problems. For one thing it's the lowest point and for another, the trim strip along the bottom tends to act like a containment channel so water can collect and has no way out and it rots the skirt from the bottom up. I also did some careful examination in an attempt to locate just exactly where that water was coming from and I believe it is along the gap between the camper and the rear bumper. That gap is not sealed and it looks to me like water can get in behind the sealed trim at the ends through that gap. Maybe pictures will clarify what I'm talking about...

Had exactly the same problem. It was road splash getting in through the edge band that wasn't sealed. Look for softness in the hard siding down there as a sign of rot having started. Yep it'll be the same problem on the other side as well.

Since I haven't seen a '09 Lance 1055, I don't know how the skirt is attached. On my '03 Lance 1121 the skirt is attached to the camper body and the seam between the skirt and camper body is covered with a piece of vinyl type trim. If your skirt is attached similarly, you may have a rain water leaking under the trim.

When I ordered our Lance, I ordered a factory installed roll out awning instead of the crank-out on the passenger side of the camper and where the lower support arm mounting bracket attaches to the side of the camper body, the trim was pinched and a bit buckled. I made an "adjustment" to the vinyl trim and re-sealed it to prevent rain water from entering the skirt seam when the camper was new.

Bill

Open up any doors you may have like the battery box, propane door, outside shower door, fridge door on the outside. Then look down where the bottom of the compartment meets the door opening. You may need a mirror if you can't get your head in far enough to see. Look to see if there is caulk missing where the bottom of the compartment meets the door opening.
I had that situation on my propane door. I had to remove the tanks so I could get my head in far enough to get a good look at it. They had left about an 8 inch gap that had no caulk & I have found water in the propane compartment after heavy rains with wind. The water made it's way down to the rear skirt & rotted the wood & electrolisis took place on the aluminum skin, eating several holes in it. Lance fixed it but now I have the same situation starting under the back door & the camper is out of warrenty. Hope this helps. The water entry points are usually not very obvious.

Big Rig