First step, contact Jayco with your vin number and ask for the structural and plumbing drawings. Between the two, you should be able to determine how the TT is built and where the tanks are located. The existing wall structure is all really thin. The floor maybe 2" thick.
When I modified my TT, I did some snooping. I looked for various holes and screw locations. I found how thick my floor was by locating a penetration hole. The easy one for me was where the 7 pin wire harness entered the TT, That hole in the floor was about 1.5" diameter, easy to see. The floor was made of a composite ~5/8" OSB, white foam, ~5/8" OSB. For screw length, I found a screws holding a cabinet to the floor and to a wall. Removed the screw and replicated the penetration depth. Worth repeating, the walls are very very thin, you do not want to accidently drill through it.
When you remove the million staples to quickly, you can easily damage the thin panels. Go slow, if you can get to the backside, use a wide rubber mallet, and tap your way around and around. Go slow, I found once the staples start to release, continue to work your way down the panel and then come back and pop them out a little more and a little bit more. Don't work one spot to much. May take a few trips around the panel. Go fast, and the panel will fracture. You can do it from the front side with a mini pry bar, just go slow, and start in a hard to see location, same technique.
With the new bed design, you should be able to have better inside access to the storage area.
From a dealership website, it looks like your water heater is under the bed. Is there anything else under the bunk? What about plumbing? Heat ducts? power?
Good Luck, make sure to post pictures of your modification.
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