I agree. I also suggest getting a set of dog-bone adapters. Some campsites don't offer a full set of 15, 30 and 50 amp power connections so you may find you have a long enough cord but can't plug it in! Lastly, it's also a good idea to have an extension for your water hose and sewer hose too in case the utilities are out of reach.
Enrico and Donna + 2 kids
RAM 2500 + Jayco Jay Flight 25BHS
Black tank Quick-e Flush, MaxxAir Vent cover, TV bracket and LCD TV, added Slideout awning, bunk ladder, added socket and reading light to top bunk, added bathroom fan switch near light switch, insulated all externally accessible storage, sealed pass through storage from interior of trailer, LED lights throughout, added LED lights to storage compartments