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Short Round, Its ONLY the larger Motorhomes that use the 50 amp 4 prong plug, it supplies TWO legs of 120 volt (180 degree phase angle between them) so it requires 2 Hots, a Neutral, and the equipment Ground. Everything in the Motorhome is 120 volt but they use like one 120 volt phase for one air conditioner and the other 120 volt phase for the other air conditioner. The smaller motorhomes use the 3 prong 30 amp plug which only supplies one hot 120 volt phase wire plus the Neutral and Ground. Youre absolutely correct, Mobile Homes indeed require 4 feeder wires (2 hots, neutral and ground) for their 120/240 volt single phase three wire service entrance, unlike a residential service entrance requiring ONLY THREE (2 hots and a neutral) typically twisted triplex consisting of two insulated hot phase wires spiraled around a bare Neutral. On a residential service at either the service entrance main panel or out in the meter base, the Neutral (a grounded conductor) is bonded to a grounding electrode such as a made earth (driven ground rod) or a water pipe etc with a No 4 copper wire. Once the Neutral is bonded to the equipment grounding conductor, THEY ARE NEVER BONDED AGAIN like at sub panels. Hope this helps yall John T Nordhoff in Indiana, retired Electrical Engineer
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