i encounter my first true trail obstacle a patch of plowed up field which shows rows of button nose-like dirt in a vertical direction from my horizontal pathway as i hit the first dirt pile at 15 mph then the wheels actually bounce one-at-a-time up into the air like a rearing pony with the right front up then down while the left passenger tire soars up then down then the left back tire lifts up then down bringing in the right back tire up then down as i bounce like loose set of basketball released from the barrel while my open bottle of soda wiggles and spills into the holder .