Yup, you get cold where you are and now I know which Parker you are talking about.
Your trailer should be much like mine, and the videos in the video manual found in this thread:
https://www.hilotrailerforum.com/f49/hilo-video-owners-manuals-youtube-1233/, Post #3 should help with much of this.
Video #36 covers "Winterizing" and should answer all your questions about draining the fresh water tank, bypassing the water heater, draining the hot water tank and then adding antifreeze to the water system. If you let the antifreeze flow from the faucets into the sinks, it will fill the J-pipes in the drains. I can get by with just one gallon of RV antifreeze when I do this, and I buy it at Home Depot, but it's available elsewhere.
Video #34 covers cleaning and lubricating the guide rod. I used Lithium grease this time, but in the past have used axle grease. I start with the top up, which puts the cylinder head about halfway along the guide rod, and then, after I've cleaned and greased both sides, I can lower the top and attend to the small area that the cylinder head covered.
Having the top up also puts most of the cables UNDER the trailer where you can get to them. Inspect their condition, clean and lubricate them. Also lubricate the pulleys. This year I used WD-40s Garage Door lube for this, which seems to dry to a kind of "waxy" consistency. I'm thinking this won't attract dirt too much but will offer rust protection.
You won't be able to get to the four top pulleys under the trailer or the cable that runs over them there. For this, you have to go inside the trailer with the top up. The lower half of your trailer has a fake wooden "trim" strip that sits on its top edge, next to the inside of the upper half. This strip is held on with screws and is easily removed. It covers the four upper pulleys and allows you to see the cable that passes over them. You'll be removing the strips on the sides of the trailer and the only one I find difficult is the one in the bathroom, which is behind the sink cabinet. I have to use a flexible extension on my screwdriver to access those screws.
Once you have a trim strip off, simply spray the cable and the pulley with your choice of lube, which will run down the cable on both sides to cover the areas you can't get to.
Replace the trim strips and Bob's your Uncle!
I have a Battery Minder (that's the brand name) battery maintainer that I leave connected to my trailer's batteries when it's stored. It keeps the batteries at full charge, applies desulfication, and will keep them from freezing. It also extends their life and I recommend it. You can find it online and it's fairly inexpensive.
Hope all this has helped!
- Jack