I lived from after Christmas throught the winter o f80-81, in Omaha, while serving as the Team Ministry Coordinator and Urban Ministry Deputy for the Episcopal Diocese of NE in my Coachmen Leprechaun.
If you don't already have this, get the largest temporary propane tank your propane dealer will rent you and set it near your mh outlet with a quick connect device. You may want to take a trip and you need propane all year so get it now while he's not selling very much. The price to fill it is at it's lowest this month and maybe next.
Get insuilation material, esp if you can sind something that has a solid backing on one side, and cut it to fit all the windows in the front and set up velcro to attach and detach as needed. I'd do it for all your windows and whatever side catches the winds, I'd keep them insulated during cold spells. There's probably a closet in the church where they can be stoored during the spring and summer. Insulated quilts can be mad or adapted to do the same thing. I used old fashioned plastich screaning with duct tape. Make insulation for aour vents. You will need to keep one cracked to let moisture out even in the coldest weather but teemporarily seal off those overheads that aren't being used.
If you arent parked by a sewer cut out and the church has an accessible one, I'd park very near it and set up a sewage draning system. That way you can leave a hose connected and run a slow trickle of water whtoufh your city water connection and down you kitchen sink and keep your gray water tanke open for a continuous slow, bur 50-60 deg water temp flowing through the system in and out. That's what I did in the park where I was stay.
If you don't have a way to dump via a sewage cutpout, keep the hoses dry in a bay below or, better yet, in the furnace room at the church bldg, use remote temp sensors and a 100 watt bulb, NOT Florescent, if the bays aren't well heated.
If I think of anything else, I'll write further.
Together in His service, and thankful I'm doing that now in the Anglican Church in North America.