shore power 110 or 220

luberhill wrote:
I see the heavy cords and plugs for the class C's so is power at campgrounds 110 or 220?

There is heavy and heavier.

3 prong is 30 amp 120 volt NEMA TT-30 and 3,600 watts
4 prong is 50 amp 120/240 volt NEMA 14-50 and 12,000 watts

You can use an adapter to plug either RV into either supply.

http://www.myrv.us/electric/