Acquiring a tank that will fit in a different location than the original is great as long as you have the space to do it.
I have discovered finding an exact size replacement fresh water tank for my XT276 is IMPOSSIBLE!! No one seems to have one so had to repair it which was also difficult as the tanks are made of a poly plastic (same plastic milk jugs are made of) and no glue of any type will stick to it.
It requires a special 'repair package' .. the repair location has to be heated and special product applied along with fiberglass cloth. Sometimes it works and sometimes it doesn't.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.