We just started caching, and up til now we have only used one vehicle for caching. However, in the near future it will depend on the area for when HBHunter and I go caching. We have three vehicles in the fleet, all with different characteristics.
When we want to to economical (Who doesn't with today's gas prices!), we will take the Civic hybrid.
When we want to do a lot of caching quickly, then the 04 GTO comes out.
Anything in rough terrain or come winter, then the 03 Silverado is the official "Geo-mobile"