Hi,
I've had 4 hot plates, and actually burned one of them out. They do have a thermostat but it is "on or off" and is located under the drip plate, fairly far from the element. One of mine had a cast iron solid burner. It seemed nearly impossible to regulate, besides being slow to heat.
The Nuwave now has 94 power levels. It is GREAT at simmering. Mine is an earlier model with only 52 levels but its display agrees pretty much with my infrared thermometer.
Naturist, make that 6000 per leg for a total of 12000 watts. If the RV is intelligently designed the microwave will be on a different leg than the kitchen plugs.
I did keep one 750 hotplate which I'll use outdoors. My Nuwave gets stored in the oven. YMMV.