The must haves for our farm work trucks are:
1: CPL toolbox (Easy access to all tools when out in the field, and easy to make if you have the right tools)
www.montezumamfg.com
2: Cross toolbox for larger tools
3: Highlift Jack (easier to use out in the field than a hydraulic)
4: Air compressor ( We use converted york AC compressors powered by 12volt motors)
5: Off road lights and spot light ( for those all nighters during cotton picking)
6: CB radio
7: Deweze bale bed on a 3/4 ton truck ( we only run 30 steers, but these things are handy to lift anything)
www.deweze.com