Question Camper Winter Living

[destino.feliz]

Hello camper enthusiasts! My husband, I and our 5 kids recently started living in a camper. We are in a stabilized, non moving camper - a 1991 Nu Wa Hitchhiker II. We added insulation inside, which has helped a bunch with keeping the internal temps warmer - while just using a space heater on low. We are sticking with electric instead of propane since we have access to electricity. Now we are looking for the right solution to keeping the water tanks from freezing. We were going to put heater pads on each of the tanks - but they are covered with some kind of medium insulation & I don’t think it would be efficient at heating the tanks. Someone suggested an electric heater to put under the camper - as we have now put a plywood skirt all the way around the bottom. Any suggestions??