Winterizing question

IMHO this is not necessary and makes opening in spring more work. The TM is set up very nicely for winterizing. If you open all faucets before opening all 4 drains under the TM everything should drain fine assuming TM is close to level. If you want to be extra sure, Close faucets leave drains open and connect shore water supply ( not water tank fill) to a compressor and blow air through the lines. CAUTION I would not exceed 20-25 psi. Don't forget to remove the kitchen sink spray head if you have one. I also leave both black and gray drains open a little just in case. Got to zero here last winter and no issues.

It gets well below zero here and I don’t use antifreeze. I have not had any problems with just draining when storing the TM. Don’t forget to remove both the inside and outside shower heads plus the sink sprayer and, be sure to drain the hot water tank. The only time I’ll use antifreeze is if I am going to be using the TM when it’s that cold, then I do use some of it. I’ll prime the toilet with 2 gal. of –40 windshield washer fluid, lots cheaper than RV antifreeze and works just as well and I’ll pour a gal or two down the sink drain to help keep the gray water tank and sewer valves from freezing, although I try not to use the sink drains.

One other suggestion. Make yourself a note of all the things you removed ( inside / outside shower head, sink sprayer etc. and leave it on the fridge or in kitchen sink. That way when you open in the spring and connect water you don't have any surprises. I do add about a cup or so of RV antifreeze to the toilet just in case a little water gets on top of the toilet slide valve while moving TM around. We also wet a piece of cotton in a glass ashtray soaked with peppermint oil and sit in the sink. This seems to keep out spiders and mice.