I have a good feeling it will work next time you try. I would just suggest making sure of four things.
1) Make sure the battery is charged fully or run jumper cables from your tow vehicle to the trailer.
2) Purge the gas lines at the stove by lighting the burners, also get the water heater and refrigerator running on gas.
3) Have someone stand outside by the furnace exhaust and listen for the igniter clicking while someone else turns on the thermostat.
4) If no heat after a minute turn off the thermostat, wait a minute and turn it back on again. Repeat a few times.
Let us know what you find.
