I think it would be interesting to see how often you wash your truck, of course this depends on location, weather, conditions ect...
But I still think it would be interesting. I live in BC so we get rain/sunshine 10 months out of the year and if it does snow, it only snows for about 1 - 2 weeks. I usually try and wash my truck every Saturday (hand wash) and other times pressure wash.
So let's see what we can get!
ie: If you choose "other", please post up your answer =)