Another Option for the trailer / tiny house ... combined hybrid PV and Solar Thermal.
PV generates 15-20% of the light energy into electricity.
Combined as a hybrid Solar Thermal that than collects ~80% of the remaining 75-80% .. plus other solar heat gain surfaces like windows and such ... around ~4x more heat watts than the PV electrical watts are available to collect.
A tiny house can be very well insulated .. thus needing very little heat watts.
Even ~200 Sq Foot tiny house will the PV potential of about ~2MWH of electricity per year .. and about ~8 MWH per year of solar heat.
No need to even go out looking for propane .. the whole thing can be off grid and and energy independent 100% from solar energy.
