Winter heat

You coach manufacturer should be able to provide detailed instructions on how to winterize your coach. There is also You Tube. I understand your concern, seems every year I forgot something - one year it was the outside shower, the next year the inside hand held shower wand. An easy fix in either case, but forgetting your water heater or ice maker or a main line under the coach and things get pricey quickly.

I wouldn't shoot for 50 degrees, that's just wasted energy. Get yourself a few small heaters and wireless thermometers, shoot for 34-36 degrees, open the cabinets and drawers, a light bulb in the wet bay plugged into a thermo cube and that should mitigate any worry.

I would still try and winterize, drain all tanks, drain the water heater (make sure it's turned off), bypass the water heater, blow out the lines with low PSI (they make an adapter for your water line to a compressor hose), and run rv antifreeze through everything. There may be an Antifreeze inlet in your water pump that will pull it through the pump and through your coach, Let all faucets run until pink, put some antifreeze in your traps and toilets. Don't forget the outdoor shower - that one always gets me.

I've always done all that in about 15 mins and worth it even if doing it a few times a year (unwinterize for a mid winter trip). That said I still didn't have luck with the clear debris filter cover on my water pump. Cheap but for some reason, even with antifreeze they always cracked. I never did a light bulb in the wet bay. Maybe I should have...