I removed the tub/shower faucets from my XT276 due to low hot water flow.
I did it all from the faucet side ~ no need to access it from behind. Remove the handles and securing nuts behind the handles, and carefully cut the sealant away from around the perimeter of the faucet assembly and carefully pull it away from the wall.
I found the excess line for the hot water to be kinked so a simple realignment/routing solved the issue.
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.