im not tryin to spam or nothin here.
but you guys outa open up a ramp forum... and since im the only professional ramp builder thats a regular to the board ( i went awol for a while due to cookie problems ) and have a few sticky threads for the basics on ramps and the rest for whatever.... look how many ramp questions there are.
but anyway fella, to answer your question
if your jumpin something like that being your in a neighboring state i could build you a steel one real cheap real easy.
but if you insist on doing it yourself. i would make it very tame and of course make it longer as you already want to do. im going to say 32 degrees should be MORE than sufficient for what you need.
http://alloyindustries.com