Safty issue or just because of weight

Just wondering why when somone is hopping thier car/truck why they get out i is it a safty issue or can you just hop higher without the person in the front seat. not talking about when the ppl are standing thier cars on end sort of thing but when they stand there hoppin it would be cooler if they stayed in but just wondering if there is a reasont hey do it.

i think its a weight issue cause u hop higher easier with less weight

cause it beats the shit out of you. and it is easier to control the hopping motion if you are looking at the truck from the side or front angle. (i think)

yeah it hurts like a motherfucker...but i can get mine bouncing beter from in it...goin 75

lol

have you ever been in a hopper? u'll break your damn back in alot of em! end up in the back seat, all over the dash etc....put a stuffed animal in the drivers seat b4 one starts hopping.......see where it ends up

imagine being in a roll over car wreck....about the equivilant.