I am in the throws of purchasing 13.5 Atwood unit. My thought was to install in rear. Now the question. Does it make sense to do this or ?
1. Buy 15 Atwood for front and move current 13.5 to rear
2. Buy 13.5 Atwood and install in front moving current to rear
3. Easy way / just install new in rear
Are you going to also change generator and service to 50 amp? If not buy the bigger ac and replace , move small to rear and wire for separate 20 amp feed, plug in separately at pedestal.