How many wheels are on the ground, acutally working, on the world's
longest highway truck and where do they drive these big rigs?  Please
include a link that can answer this question.

Hi lrod,

  Good day and thanks for your question. In the comments section, the
road train has been introduced.

  The longest road train ever assembled was 1,018.2 m (3,340 ft) long
and consisted of 79 trailers with a combined weight of 1,072.3 tonnes
(2.364 million lb). It was pulled a distance of 8 km (4.9 miles) by a
Kenworth C501T truck driven by Australia's Steven Matthews, near
Kalgoorlie, WA, Australia, on October 19th, 2000 in an event known as
'Doug's Tug', after organiser Doug Gould. The entire setup had 958
wheels.

Source :: Guinness Book of World Records

If you have any clarifications, then please don't hesitate to ask.
Thank you for using this service and have a nice day.

Cheers,
Aditya2K

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Clarification of Answer by aditya2k-ga on 03 Nov 2002 15:31 PST

You can find a video of it at
http://www.guinnessrecords.com/content_pages/video.asp?videoid=100029

great answer!!

In australlia there are behemoth's capable of carrying 350+ heads of
cattle. Think of a tracktor trailer, make the trailer bigger, then
hook THREE of them up to the tracktor. That's the kind of thing your
looking at, then reinforce it all with big metal rods, because they
are worried about wild animals getting at the cattle. It's a monster,
a brute. I can only guess how many wheels.

Okay, here is 45 seconds worth of research on what I said before. They
are called 'road trains', they are in fact australian, they have 10
wheels in the tractor (2x4x4), They also have 12 wheels with each
trailor. http://outbacktowing.tripod.com/
That site has pictures of various road trains. Enjoy!

I could not find the longest, but here is a picture of a rather big
truck: http://www.sparwood.bc.ca/pics/dcp_0090.jpg.html