we did a job for a car reseller some time ago and the boss bought a couple of car from humster. at first try, the "low poly 3ds" versions of them crashed sketchup instantly.. i had to send a mail to them and they were very polite and sent me back a custom skp-low poly version.. still pretty hi poly, but at least sketchup manged them (after a furter cleanup of the geometry, in particular some utra hy-poly details, such as headlights). now with beta vray maybe you can use proxy, as far as i know also maxwell can mange proxyes, so maybe it's a bit easier..
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