TC&Z,
Minor point, but the rig was my uncle's, not mine. :) Interestingly, they also purchased it from a dealer in Florida, I believe the name is synonymous with "slothful 24 hour time periods". :) Anyway, your description of the cause sounds very plausible. I will pass that along to him, not that there's anything we can do about it now. I think he's been beating himself up that it was his fault 'cause he didn't hose it down well enough after their Florida trips. I think he'll get some comfort in your story. Thank you! :)
His wife passed away a few years ago, and his Parkinson's has progressed to the point he can no longer drive any vehicle. The last couple of years, I've been driving it for him. I'm just thankful that when I drove it home from their camping lot last Fall, the line didn't fail while I was driving. It failed right in his driveway, when they went to move it this Spring. His kids are now getting it ready to put it up for sale. Want another for spare parts? LOL
Safe travels,
~Rick