How do you guys in colder regions keep your trailers from freezing up. I am not talking about winterizing my trailer. I have a few monthly accounts that I service and I do not want to winterize after each job. I'm thinking about renting a storage unit but I'm worried for those nights when it dips into the teens. I've talked to the owner and I don't think they are gonna let me use propane heaters in the unit (understandably). The unit does not have power. I appreciate any suggestions you guys come up with.