Possible, yes. Practical? No.
Unless you have a large crew with you to help carry and move the plywood, as well as a nice large truck it's not very practical. a 6x4 piece of plywood is heavy, large and awkward, for a the run up you would want two pieces + a prebuilt ramp + a 12 foot rail and you've got a lot of crap to carry with you to your local park.