Sort:  

If it comes down to it, you can do what some friends did on their property (large family with kids of all ages).

  1. Buy a massive tarp, the largest you can afford.
  2. Build a wood frame with some of your soon to be no more trailer :(
  3. Fill in the blanks and insulate with cardboard, large pieces and huge boxes can be obtained for free.
  4. Get the tarp over it before everything gets wet.
  5. 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.