Update!:
Well, I drove my motorhome in hard rain all day today, and NO LEAKS! I guess I just didn't have the slide jacks tight enough, or crank in the slide enough. I let out the slide before the rains came over the weekend, and found an area on the top of the slide where the leaking had apparently happened a couple of weeks ago. I would be sooooooo glad if I finally have that problem licked. I haven't had the courage to see how it does with the slide extended yet, but that will happen this weekend. There are still a few vibration related problems to fix on the factory dime before I start using some self engineered fixes on some items. I have already put a shutoff valve on the water tank vent tube and almost completely shut it off, which eliminates the syphoning out the vent tube. If I need to have additional venting when I fill the tank, I'll just open the valve completely while I am filling. Other items will be putting velcro on the face of several drawers to help keep them in place when I am driving over urban RR tracks. My only lingering concern at this point is the number of miles I am driving. It looks like I will have close to 30K miles by the end of the first year! Glad I'm not putting all those miles on a Chinook! I am already thinking of having the interior reupholstered in a couple of years, depending on how well the interior holds together, but, aside from some wrinkling on the dinette seats, there isn't any apparent wear.