Best brands for full time and cold weather living

As for fresh water. Fill your tank and make sure there is a heat source near it. Even a light bulb (incandescent) will do. Just connect your hose when you need to fill the tank

You might get better results with grey and black water just connecting when necessary to dump. Again some heat in compartment.
Can you get a 100 lb tank delivered in your area? Will the propane company be able to fill you all winter? (road conditions)