Had all gaskets replaced 3 times under warentee, the the whole box pulled out and the support beam that holds the rollers was broken and they welded it put box back in. I water checked it with slide in and out with hose before I picked it up. It was good. This was 2 years ago. Itís doing the same thing I took it in to have fixed again now. When I wash it now or after hard rain with wind water comes in bottom of slide on both sides. On the most forward side (right side when inside bed room looking at slide) itís not bad but on the side to the rear of Rv (left side) it comes in following the plastic trim piece on the bottom of slide and drips all along the plastic piece. Water is all up in there. I thought that piece was a protector for the roller to keep wood slide floor protected but the roller is to the left of it. If I cut the plastic the water will still prob come in just not make it to the hole length of the box and the edge will still get wet. Again, only does when slide is in. When you look at the slide the bottom is almost flush with coach. The top is not as snug. The slide mechanism is inside under the bed so not easily adjusted, if that would even help
. I think the water , when gets past my slide topper on the right side corner(looking at it outside) gets in and around the top of the gasket and runs down the length of the slide and also runs along the bottom to the other side. I have some ideas to try but wanted every one to check their sierras for the same leak. You may have it and not know. Iím hoping a slide adjustment and some silicone caulk outside in the right side top corner may fix it.
. To check just take a hose to it real good while closed up and get water under your topper if u have one. Then go inside and crawl under bed and check where the rollers are and see if any water is there. Iím not talking about a solid stream of high pressure Water but a nice flow like when you are rinsing off after wash. Any help or other ideas would be great.