If I were to order a trailer today and wanted lithiums batteries, what provisions are in place to allow the batteries to be changed in freezing temperatures? I understand the trailers are not four-season, but I'm wondering about temporary drops when camping in late Fall or early Spring, especially if I were to invest in the foam insulation and heaters on the tanks. Is the area under the dinette in the 21C kept above freezing when the furnace is running? How about on models where the batteries are mounted on the tongue or bumper? Do the batteries have an internal heat source? Heating pads under them?
Is there a DC to DC converter that allows the lithium batteries to be trickle charged from the tow vehicle’s batteries without frying the alternator? If not, can they be trickled charged from the solar panels while driving?