Replying to Setup Advice?

So this probably isn't going to be a repost, I've got kind of an interesting situation with my setup. So basically my parents won't let me put a setup in our yard cause it's kind of small, but I had the idea of making sort of a "mobile" setup. I have a big tube, and just built a lip and covered it in turf. My plan is to bring the lip, tube, and other materials to a hill behind an elementary school and set up every weekend. Only problem is, I need a way to make a drop in with speed that I can put over bare grass and easily take home every weekend.

Lattice or construction fence are options, but would they work on bare grass? Also, can you use tarps with water/soap? Any input is wanted, thanks