Not sure about the Palamino, but the Flagstaff/Rockwood 5th wheels have the tanks in the very front of the frame.
Please let us know how the install goes. In my experience (I dropped mine to replace sensors), do not pick a windy day!
Once you see where your stuff is located (valves and sensors), I recommend cutting some access hatches so you don't have to drop the entire thing if you need to access the valve or the sensor wiring.
I have seen this done from the top (though the floor), but I don't recommend it.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW