If they're actually running at full power. I have four or five 1500-watt space heaters, and all have lost oomph over the years. I use a Kill-a-Watt to measure their actual draw, and apportion them among the circuits. The place we stay in Denver, sometimes during the winter, has two 20-amp outlets available to use. They're on separate breakers. We use one to plug the coach in to, and will run a space heater in there along with the other usual loads (and turning off the space heater to use the microwave, for example). We use the other outlet to plug individual space heaters in to, usually a 250-watt one in the basement storage where the water pump and water lines are, and bigger draw one inside.Then 2-1500 watt heaters will draw about 25 amps.
The OP could do something similar with the power at his pedestal, assuming that the pedestal is wired such that the outlets don't share the incoming power, and it can handle putting out 30 amps and 50 (or actually 100) amps simultaneously. Not all can. But if so, plug the coach into one of the outlets, and plug heaters directly (via adapters) into the other outlet. And use appropriately beefy (gauge, not appearance) extension cords.
Actually, I'd suggest that anyone using space heaters test them with a Kill-a-Watt. It's good to know if your 1500-watt one is actually a 1000-watt one, even if you have unlimited power. And conversely, I bought one a couple of years ago that was wired weird or something, and was drawing twice what it should have been--too much for the Kill-a-Watt to measure, but when I disconnected the wiring for half of the heater elements, it was 1500 watts. I don't know what led me to check it before using it, but I'm glad I did.