It's going to be tough to get it strong enough to hold. You'll need to run over it with a very heavy truck many times and probably let it melt and refreeze a bit after that so it's almost like ice. I've tried the snow jump too but as soon as I hit it the tire just sliced right through the snow. I'd suggest building a small kicker out of scrap wood and clear out a nice landing area on a decline to start off. Just keep the jump area shoveled, should work great and you can keep the ramp for when there isn't as much snow later in the year.