Kneel999,
I have an Eagle TT also, that does not have the Glacier package. I removed the underbelly wrap from mine a couple of years ago to add some insulation and see why my black tank flusher wasn't working. It was reasonably easy to remove the chloroplast sheeting - just a tone of screws holding it to the framing. On mine, there was foam insulation sprayed around all of the overflow tubes and where the drain pipe came through. I didn't want to damage that, so I just dropped the underbelly rather than removing it completely. I discovered the underbelly is screwed to the bottom of the I-beam frame and there is a sub-floor on the top of the I-beam. The bottom of the black, grey, and fresh water tanks and a couple of wires were exposed, but no ductwork or water lines. They are between the sub-floor and main floor (above the I-beam frame). I decided not to remove the sub-floor. The good news is, you should be able to access the area you need without removing anything else . . . unless the rat has eaten through the subfloor and gotten into the duct/waterline area above it. Then you're in for some
major deconstruction! Hopefully, it's found a nice cozy home in a nook or cranny around one of the tanks or a similar area.
I decided not to add additional insulation, but you certainly could glue some sheet foam to the underside of the sub-floor. After cleaning out and reinstalling the black tank flush, I was able to re-tuck the underbelly into its original position and reinstall the screws holding it in place. It was a bit of a challenge finding the screw holes in the I beam, but I finally got it all put back together. I might suggest picking up a can of Great Stuff
pest resistant foam spray (@ Home Depot or Lowes) to spray around any holes you have in the underbelly around pipes, tubes, wires, etc. And some black Gorilla Tape (not Duck Tape) to cover any cuts you might have to make in the chloroplast. You're probably looking at an
all day project.
Hope this helps and you're able to dispatch your "guest" without having to take you rig back to the dealer.
That's where the really big rats live!. GOOD LUCK!