I guess the thing I wonder, when you say "special", do you mean things like these oddities
http://mtm2.com/~trucks/trucks.cgi?s=(S)tock+(T)rack+(P)rop
http://mtm2.com/~trucks/trucks.cgi?s=ch_2005
http://mtm2.com/~trucks/trucks.cgi?s=Malibu350
Or racing cycles on crashcart's new tracks (which might be fun, by the way)
http://mtm2.com/~trucks/trucks.cgi?s=2x2+Monsters
Or motor boat racing?
http://mtm2.com/~trucks/trucks.cgi?s=mbm
Or big rigs
http://mtm2.com/~trucks/trucks.cgi?s=Rochester
Or theme'd trucks
http://mtm2.com/~trucks/trucks.cgi?s=nhl
http://mtm2.com/~trucks/trucks.cgi?s=nfl
http://mtm2.com/~trucks/trucks.cgi?s=zli
Antiques? - lots of these around
http://mtm2.com/~trucks/trucks.cgi?s=oil+truck
Or replica trucks.
As much as it's a nice thought to honor truck makers, tourney and race results are still usually the result of a driver's skills.
If you choose some trucks, then you'd have to figure out good tracks that accomodate them. Racing motorboats on pavement would be an obvious problem, but racing big rigs not so obvious. For those you'd probably want tracks with a little more elbow room.
It would probably be a good idea to collect the trucks into packs so everybody in the race is working with the same ones, and you can eliminate the laggy ones.
My 2ยข