What is the heat strip wattage? Plus additional 2.5A for the fan.
Have you considered several small ceramic heaters? Very quiet, 1500W, with thermostat, flexible and can be placed anywhere and very small fan draw.
We carry 3 ceramic heaters and they are always our first choice for heat. Easy to manage on 30A with high/low settings.
I added an independent 20A circuit that plugs into a rig storage plug or an extension cord to a 20A pedestal plug when available with a 30A plug. So 30A+20A available.
We have used ceramic heaters for 40 years in boats and RVs.
