I drilled a new hole in the rear wall of my TT so that the cord would be more centrally located for ease of hooking up regardless of which side of the trailer the power pole is. It is also under the rear bunk which protects it from the weather.
As far as the old power door is concerned I just left it in place. I bought a lockable door about 8" square to put in its place so I could take advantage of some unused storage space where the old cord was wadded up but I never installed it.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.