Jim Dick said:
Fred,
In a word, NO!!!! An RV 50 amp circuit is NOT 220V.
uh, |110-0-110| or 220 volt split phase, The explanation is complicated but that is how a dryer is wired, Trust me on that, the heat element in the dryer is 220 volt (conects only to the two outer legs) but the timer, motor and control board (if any) are all powered by 110 volt. Thus the standard dryer outlet is 110-0-110 (or these days it is 120-0-120 but alas, that 10 volts makes no difference)
Most folks just call it 220, but the full name is "240 volt split phase" and the split, is, of course, 120 volts.
That way,,, If you are running everything on one leg of your 50 amp system, you get up to 30 amps (dryers are usually fused or breakered at 30 amps) max on one leg and "Common". if you are running everythign possible you have 30 amps on both legs (assuming a perfectly balanced rig, which, of course, is a dream) and no current at all on the common.
In days of old, when folks were bold, common might well be the ground itself,,, However that has not been code since about 1942 (WWII to be specific) I've read some very old electrical books.. Older than I am (I'm a 51 model myself)