Look for a trailer with a "4 seasons" package. At a minimum this should include double-pane windows, and a heated/enclosed underbelly.
For the winter months at least, find a location with electricity, fresh water hookups, and a relatively mild climate if possible. You might also look into a large propane tank commonly called "extend-a-stay."
Make sure that your water pump is easy to access and is set up with a bypass to add antifreeze if needed.
Disconnect the water hose, blow out the check valve on the inlet. Leave the water heater on, the furnace on, and the thermostat set to some fairly low temp. The furnace should keep the underbelly and waste tanks in good shape. Leave the cabinet doors open so plumbing along the walls can get heat.
It would be a VERY good idea to have a reliable knowledgeable person to check on the heat for you. You could also install some sort of network-enabled temperature sensor, that you can check from your smart phone. Then if there are problems you could get someone over ASAP, even if you were not home.
Otherwise you could learn how to do a quick winterize. Drain the lines and water heater, blow out the lines, and pour some antifreeze in the drains and toilet. After you do that a few times it won't take but a few minutes, and would be cheaper than keeping the heat on, and simpler than worrying about it.