Why do you want to use 240 volts?
Your coach is not wired for 240 volts.
How do you plan on powering the space heater?
Our coach is 26'. We use two 1,500 watt electric space heaters when power is available and temps get down to zero. One heater is plenty when temps are around freezing.
The specs on these heaters are iffy at best. Because it depends on how well insulated the space is.
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