There isn't enough floor surface area in an AS to heat it this way. To make up got this the floor would have to be so warm that it would be uncomfortable.
The ratio of the heating area to trailer surface area is to low. Especially with the 1.5" thick walls that provide little insulation.
Same problem with the AS when it comes to water based radiant floor heat.
You're also generally limited to 30 amps of power, electric would take a big chunk of that, probably requiring much more. You couldn't boondock with it either because electric heat would drain the battery very quickly.
Propane furnace forced air pretty much gives you the best bet.
You could get a air conditioner with heat pump for when you do have electricity, but that generally only gets you down to 40 degrees and doesn't heat tanks.
From ebeco's web site, "Perfect for chilly nights in early summer.". That's the most you could get no early spring or cold fall coverage. Especially not winter. If you're only going to use it during summer, late spring, and early fall, you'll find a small ceramic electric heater will keep you warm.