I don't know the layout of your RV, but we added one to the bedroom and kitchen of our RV and all I did was figure out where I wanted it and for the bedroom there already was 110 power behind the wall with more than enough slack in it to splice in an electrical outlet. For the kitchen I was able to run new wire from an outlet that was already there but about 3 feet from where I wanted the new outlet. You'll no doubt find that it's a lot easier to run wire and connect in interior walls than exterior.
Steve & Nancy
2005 Itasca Sunrise 33', W20 Chassis, Ultrapower, Henderson Trac Bar
2012 Chevy Captiva Sport AWD, ReadyBrute Elite Tow Bar, Blue Ox Base Plate, Protect-A-Tow