Gaylord Opryland Hotel in Nashville is looking for a cake decorator/pastry supervisor in this ad. I know nothing about your industry so you'll have to vet the ad. There's a campground within walking distance of the hotel. Maybe you could work out an arrangement for a room for evenings when it is below freezing? If not at the hotel, then elsewhere? I over-wintered in Nashville once. It can be done.
Good luck.
/CC
PS: With all due respect and empathy, people who own motorhomes are not "homeless". Believe it or not, there are those of us who aspire to this lifestyle. I recommend you take a deep breath & embrace the season that God has given you. If it's not your cup of tea, this, too, shall pass, I promise!