even if you had a hill with an in run and run out it would be either really expensive or a huge pain in the ass to maintain, plus it would probably be a shitty jump.
I don't think my ACL would like a turf landing. Snowflex is as close as it gets. Otherwise there have been a lot of home build water ramps and foam pits.
It's hard to find landings that actually slide well enough to ride out of. There is mSnow but that's expensive as fuck if you want enough for a jump landing and it's solid and spiky so fuck bailing onto that shit. Nothing else slides well enough so (unless you have deep pockets and huge balls and get an msnow landing) you just gonna stop and get fucked up the arse by your momentum
haha one time I took the rail out of my setup and just flew off of the ramp spinning 3's. It wasn't fun. I can't imagine a bigger jump would feel much better.