Before we get into what we've done, take a quick look at the set over on PEERON. The stock set is the most complex truck set that Lego ever made for town use. It has many more parts that a lot of the buildings in the Lego catalog from that time. The truck also shows a movement toward larger vehicles as the cab is still a 4-wide design but grows to 6-wide by the end of the trailer. Other truck sets (like the Police Surveillance Squad 6348 from a few years later) would use a very similar structure but were no where near as complex. The fact that the ramps system works so well is a real tribute to the Lego designers.
We actually bought TWO of these sets from eBay to get this one complete (the drivers' helmets were the hardest parts to come by). Both sets were quite cheap because they were missing parts but together we have enough for two workable trucks. Ironically, complete sets sell for prices that could easily buy multiple incomplete sets-- so shop carefully and you'll literally get "two for the price of one". The truck not shown here is missing the large Octan stickers on the trailer and one of the red ramps-- that's it!
I don't think I'd enjoy bouncing around in a race car on the top level of a HUGE trailer... but minifigs have no fear! In this picture you can see the metallic engine parts that we added. Also note that the vertical supports for the rear wings are the same color as the car bodies-- on the original set these pieces are all black (a rare lapse for Lego, this seemed like an obvious upgrade to us and greatly improves the appearance of the cars).
All this is perhaps best seen by watching Tyler's tour of the set. You'll also get a much better look at the modifications to the tractor (not photographed well here) and how the ramp mechanism works:
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