Pro tip: make vehicle sideways
I did this before, iirc, the vehicle was sideways and i was forward which looks weird, it should be the player that's sideways and not the vehicle itself
While you can't rotate joints outside of animate mode, you can select that joint and place a new one to have the two connect and use the newly made joint to rotate the mountPoint in a certain direction, just move the joint to a 90 degree rotation around the mountPoint and then you can delete it and the mountPoint will stay rotated until you try to rotate it without using a Joint and possibly when trying to move it
You can use a joint named 'cam' and have it face the same direction as the vehicle and that'll be used for the thirdperson camera, i think