We camp at several friends who have farms and the place I camp at is as far from the stables as I have cord.
I normally carry the 100 foot, 25 foot, and 35 foot shore power cables as well as the Franks Auto-Transformer. Of course I don't use them every time.
I have needed the extensions at 3 FAMCAMPs as well. Quantico, VA, MacDill AFB, FLA and Hill AFB, UT.