If you came pre-wired with factory wires waiting for a furnace
or not is an issue I do not know, on that issue I would call Casita
, or check out their boards, they have something on that, I see fiberglass trailers maybe two to three times a year and never made a note of it. Casita owners can be asked under "general chat" here too. I would not fear the wireing its simple though.
If you have no 120 volt supply? and you are parked a while with out it, the catylitic heaters preform well if the rules are followed with zero drain on power.
Check out those discussion threads here.
I would assume all the wiring is there under the carpet somewhere regardless of the heater being originally ordered or not. Since this was a southern trailer, the original owners didn't order the furnace as they had no need for it. I use a cube heater when I have full hookups, however, when I am without power (120 volts) a gas furnace would be really nice to have. Thanks, Ron