My advice as a personal injury lawyer is get rid of the jump. Some kid gets hurt and ends with a controller in his mouth to move his wheelchair and I guarantee you will be sued and liability waivers are fairly easy to get around.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1