If it comes down to it, you can do what some friends did on their property (large family with kids of all ages).
- Buy a massive tarp, the largest you can afford.
- Build a wood frame with some of your soon to be no more trailer :(
- Fill in the blanks and insulate with cardboard, large pieces and huge boxes can be obtained for free.
- Get the tarp over it before everything gets wet.
- Invest in duct tape for the eventual little holes
Please note this was a year round HOME complete with wood and cook stove. It's a viable option until you have the finances to upgrade, they lived comfortably there for years.