Lego Indiana Jones (PS3). WTF people!

Fun game but I think it is broken. I'm at the point where you are supposed to jump from truck to truck to steal the Ark. I beat up all the bad guys and then apparently I'm supposed to hop into one of the trucks and drive it. Here's the kicker, the game won't let me get into the trucks and them. I wander all over the top, along the side rails, and even try to do the trick where Indy hangs off the grill. None of it works. Is this damn game bugged? What the hell Sony and LucasArts. Anyone can help, post in the comment section. This is pissin' me off.