a 'cable hatch' is perfect and fits nicely thru the bottom of the storage bay where your 120v outlet already is.... $10 and done. There's a reason factories don't install 'outside' outlets, the mess 'up' the pretty of the coach!
'14 Palazzo 33.3 bunkhouse 34' diesel
KingTailgater2 Dish HD, 100w/5a SOLAR, BlueOx
110,000+mi since '14 - US, Alaska, Canada (also, '14 Gulfstream Amerilite and '07 ForestRiver Rockwood) : )b