Just some off the top of my head thoughts.
Random drawing/names on a hat?
New categories: Highest Odometer, Lowest Odometer? Would need to be limited to bullnoses or at least odometers that roll over.
Some kind of guessing game? Similar to how many jelly beans in a jar but doesn't need to be physical. Could deal with odometers or total lug nut count (assuming there is a vehicle registration chart) or....
Scott
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Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole
But there ain't nothin' wrong with the radio