Fantastic to see Daniel back again.
When I had my Trail Lite with the slide I found that any time I had the right front side lower in parking, if it rained I got a wet carpet behind the driver and into the area between the seats. My assumption was that the lower right side exposed more of the slide and the nose down aspect "torqued" the slide just enough to cause a leak. I solved it by modifying the home parking space with some drive on wood blocks. On the road when we "bedded down" I made sure the rig was very level or slightly lower on the slide side.
My rattle was related to the slide's forward mechanism. The two arms met with a pivot rod that was retained by a hitch pin. The rod was longer than needed and let the arms rattle together. I tried rubber hose (recommended earlier in the topic), split grommets and even wrapping some rags. The rags worked the best for noise but I was afraid they would get caught in the arms and actually cause a greater problem than rattle.
My final solution was when I sold it and bought the FW Siesta 24BB with the double slide ;<)
TT
With the wife and kids (1 Dobe and a brand new Border Collie)