we use several, but each is used on the LOW setting, since that provides usually enough overall heat to keep things warm enough to keep the chill off, but also leaves enough room to continue power to other things like TVs, receivers, computers, etc.
even those of us with 50amp coaches have similar issues, though we just have more room in the power supply IF we are plugged into a 50amp shore power connection. When we are at a 30amp RV park or campground, we have the same issues with power management as you do.... 30amp max is 30amp max, no matter the size of the RV.
We use our propane furnace for those times when, at least during the morning, you REALLY need that additional heat, but most of the time electric heat serves the purpose.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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