A newbie question; I have a class A w/ a 25' 50 amp electrical cord for hookup at campsites. I am thinking I should carry an extension to that just in case I can't reach the box at a campsite. Came close last time out. Camper's World has a special now on a 25' extension cords. If I buy a 50 amp extension, can I drop down to a 30amp adaptor for the whole 50' of cord if necessary at a campsite that only offers 30amp. Or should I buy 2 extension cords, 1 50amp & 1 30 amp to have on hand for those situations?? Thank you, Sandrich