engine access panel indentations on the side of the bus makes for a great hand hold, so do wheel wells for that matter.

the pull ropes they attach to the rear door of delivery/box trucks

spoilers on the tricked out ricers
spoliers on the *****ty ricers

garbage trucks are tough, but have a brazillion places to grab

flat bed trucks are the best

pickups are just too easy

yeah call it what you will,
but the whole "catching a ride" thing has been done, its fun
its also an insanely stupid idea
but isn't that why we do this kind of stuff anyways?