Today i was riding around town, when for the first time i saw this little multi wall thing, it was like a box about half a foot high and quite wide but it had another box on top also about half a foot high, theres about a foot between start of second box and edge of first, so i pedal hopped up onto the first one then on to the second but couldnt stay on bike to jump down other side my front wheel just kept falling down before i could pedal hop again. what i need your advice with is how to keep front wheel from falling when pedal hopping up obsticals. cheers.