I backed mine into the pines. To keep the tires from sinking into the sandy ground I used two 4 foot 2 x 10's.
One side of the TT was a bit too low so I added a 2 x 8 to level it out for winter. We are trying a cover this year to keep the pine needles off the roof.
I used 2 x 8s under my PUP tires for years until I had a gravel pad for it to sit on.
I looked into placing the TT up on cement blocks but it was a lot of work and no guarantee that the block would not settle into the sand and stress the frame.
Locally it seems the dealer and manufactures simply winterize and park them on their gravel lots all winter.