I'm pretty sure that if I sat down and thought about this and did the math behind it, I could make it.
I would just require a man to dig the trenches for the posts. Then again, I could have it slightly elevated off the ground, and just make the hill higher to compensate for it. At the same time, I think that could potentially impair its stability so... Yeah. My future hubby would dig the trenches, I would do the math, and at the end of it all our kid(s) would have a roller coaster.