I see you are going through with covering your customer route for piano tuning through this coming winter season.
Days are getting short here in Minnesota (shorter in your area). I still cannot see how you can possibly use the MH without winterizing the water system.
I winterized two weeks ago continue to camp winterized. No big deal! No need to waste extra heat and energy to try and keep exposed plumbing from freezing and bursting.
I hope you have some backup plans for getting shore-power, etc. along the route.
If you run into problems like Black Hills in S.D. you will be in deep trouble.
Good luck. You will need it.