Purchased a used 2018 Thor Siesta 24SS. This is a Class C on MB chassis, has a dinette slide and a bedroom slide on drivers side. Like the rv so far, however have a water leak coming from the top of Dinette slide when it is retracted, no leaks when extended. Seems to especially leak when the drivers side is higher than passenger side of chassis. I imagine the water has easier time of coming in or being noticed as water runs downhill! During heavy rain or while washing is the worst. Any ideas how I can increase the sealing along top of slide? It also has slide awnings so must get under them somehow.