Duane - they are behind the RV. Not near the back on the side of the RV but literally, behind your ramp door in most cases. That said, some are offset from center of lot, still, all the way to the back.
Guidance I'd give anyone needed to know how much power cord, sewer hose or water hose is: enough to reach the center of the back window, then 6 feet more. For me, I used a 35' water hose and it reached fine. My UDC is right behind the storage compartment. Those who have power cord reels will not need an extension. Those whose power cord is stored inside the rear cap and those whose power receptacle is on the side but near the back - also, not a problem, no extension needed. Sewer, that's a toughy - bring it all! I'd say plan on 35 feet and hope for 30.
Jim
Jim