Hey every body!!

When i,am making vehicle collision does it have to be the same as the model by following the sealed world rules or can i just make a box that fits around the vehicle instead, as long as it is using the same tags?
I would prefer to make a box that fits roughly around the vehicle because at the moment i,am not so great at following the sealed world rules on vehicle collision. I just wanted to know if it is possible to use a simple shape rather then having to do tedious work on trying to fix my errors with terrible camera control.
Thanks in advance!