what does everyone do about their LQ trailer in the freezing weather?  We will use our trailer during the winter months to go to shows, sometimes it will sit at the house for a few weeks not being used.  To keep lines from freezing in the past I have emptied the water tank and will leave a space heater turned on in the LQ.  I have never actually winterized it because we do use it.   Is this the best way to handle the non-winterizing of the trailer?

That is what I do if I am using it during the winter.

Since I don't use mine in the winter I take it to the local RV shop and they winterize the entire system.  However, since you do use yours ... I suggest also draining your water heater as those are expensive to replace (I've heard finding a replacement is difficult now).  Most water heaters are accessible to the outside and freezing potential is high.  Not sure an interior heater would be enough when it gets and stays cold.

Put a little bit of RV antifreeze directly into your dump tanks to protect them.  You can pour it in the toilet for the black tank and down the sink for the gray water tank.  Keep your fresh water empty until you are ready to use it.  Open your cabinet doors so the heat will protect your water lines in the living area and the bathroom.