No heat to the garage?

Just purchased the 2013 Cyclone 3110 and now realize there is no heat vented into the garage area. I race motorcycles and they do not have coolant so they can possibly freeze. My Raptor had a vent to bring furnace heat into the garage. I guess I can plug in an oil or ceramic type just nervous due to fuel jugs back there. I could leave the sliding door open but again fumes from the fuel will invade the coach area. Previous owner installed a 3rd A/C (9.0) unit in the garage. Any way to install a heat strip in it?

Thanks in advance,

HJ