We have a 2020 Travato 59g with tank heaters. Are heading back from CA to MO till end of March. What’s lowest temp I can expect tank heaters to protect to. This is our daily driver. And only vehicle. Though we don’t live in it full time. I’m older male who likes to use toilet daily so don’t want to winterize completely. Winebago says I shouldn’t use heaters below 32 ?