Keystone is not known for quality and certainly not as a trailer for freezing weather use. Both will have exposed pipes below the trailer. For cold weather trailers, you need to look at Arctic Fox or Lance.
A word of caution. Some manufacturers slap on a sticker calling the trailer a Polar Pac or an Arctic Pac. This does not make this a 4 season trailer. A four season trailer will have better insulation, enclosed and heated underbelly or basement. Some will have electric tank heaters which will require electric hook ups. You will also nee more than one battery to make it through a night operating on just 12 volts and the furnace.
Some folks that use these types trailers in cold weather, do not fill the fresh water tank, and leave the water system winterized. They also do not use the waste tanks to avoid freeze up problems.
Another issue with small trailers in cold weather is moisture build up in the trailer and condensation on the walls and windows. You will need to keep a roof vent cracked open to vent the moisture. The human body gives off a lot of moisture and cooking just adds to it.
I don't want to rain on your parade, but be ready to deal with the winter issues and RVs. We have a well insulated 4 season 5th wheel and I don't like being in it much below freezing. We keep it warm with either electric space heaters or the furnace. The furnace uses a lot of propane. Make sure you have two propane bottles, not just one.
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