The problem is its a corporate environment where we have to move quickly to achieve certain objectives to sell cars. We cannot have the cars tied up in a studio very long so they can get on the lot and the photos can get online for our customers to see. Our objective is to get the cars in and out of photos asap so we need the best we can get. I would love to do a set up like i read about and have phenominal photos, but the fact of the matter is we are not shooting for the manufacturer. I would also love to be shooting with a 5D but the executives don't see it that way either. We have to try to keep costs low and still get good results.
A tripod won't slow you down, it'll give you better pictures, using cheaper constant lights with exposures of a few seconds instead of a fraction of a second. The difference of 5 seconds per car isn't really that important i'd have thought.