I am fortunate to have all of my farm in a small area. I try to do all mechanical work and repairs at my shop but sometimes the unexpected happens and I find myself working on things out in the field. Having a "Crash Box" that can be easily loaded in the box of my pickup and taken to the scene of the repairs with a minimal amount of extra trips that might be required to get the proper tools where they are needed. I don't feel that a full fledged service truck is justified but this is an acceptable substitute for my needs.