During my last year of being the proud owner of a Heartland Gateway, being a member of the owners group and forum, i have seen nothing close to what has happened to Nicole here and do feel sorry for her problems, however it sounds like Heartland is trying to get things taken care of.
When i winterize our unit there is very little antifreeze in the tanks, mainly in the water lines and pump so seeing pink leaking from the tanks wouldn't necessarily happen at least with the way i use antifreeze anyway.
Also as others have stated, trying to live in the unit in ND winters without any trial use might be considered a little risky......we had to use our Gateway for a family emergency during an extremely cold winter, it was foolish of me to think we would have no trouble, we had some issues but with the help of Dan, he saved my bacon, had our problems handled with his suggestions on what to do for extreme cold temps and now, as others have also stated could.and have used our FW in below freezing temps "at our own risk", i know freeze damage is not covered under any warranty i am aware of, Dan has mentioned, trying to live in the unit while there are still leaks, broken toilet, and flooding, "you are asking for more trouble", that is my opinion as well.
I realize the cost of living in ND right now is outrageous, but wages are pretty darn good as well, so if it were me, i would.bite the bullet, get the rv into a dealership for repairs and get past the resentment. Once it is repaired, you can move back in knowing everything is correct and working properly, set it up right for extreme weather and be fine from there on out. Some of the companies out there do cover hotel costs, Good Sam comes to mind, as well as my insurance companies policy for roadside assistance/emergency repairs, i am sure there are more than just one, something worth looking into, saying that, i don't think any would pay the cost you are talking about for a motel, but i know from others who are working or have worked in ND recently, there are places a lot cheaper, rooms for rent, room mates needed, ect......
I have rambled enough, hopefully you will allow Heartland to do their job, it sounds like they are trying.