Attached Link: LukeA's van

LukeA's van and Vanishingpoint's ambulance both are built split up so you can hide parts.

http://www.renderosity.com/mod/bcs/ambulance-for-poser-/79855/

For vehicles that are one whole piece... I usually first try to see if I can hide some parts by making certain material zones transparent. If that's not an option I will use small camera focals to show a full car interior, then make the camera focal larger for close-ups if possible.