Hmmm, so mixed reviews.
For those who asked, an electric baseboard heater is simply a calrod type resistive heating element with aluminum fins fitted to it to increase convection air currents across it, no electronics. I did think about using one with a built in, bi-metal thermostat, but as mentioned, those contacts would get cooked on DC. Really, 2000 watts, which converts to roughly 6800 BTUs isn't enough to heat the trailer, so it could be left hard-wired right to the panels.