Okay, I'll try again.  I started to post a reply and then I couldn't find my blankety-blank pictures

Here's  the trailer  hooked up an ready to run

 Here is a close up of the box with the controls in it.  There are two 2" valves, one for each of the 1650 gallon water tanks, and two 1" valves with meters, for 1" lines which attach to the herbicide bulk tanks.  For the most part I just use 250 gallon cage tanks. 

 Here's a little longer shot of the same thing, you can also see the pump mounted ahead of the box, along with my tool box, various miscellanous adaptor couplers, and the 3/4" poly line which hooks to the float valves to fill the tanks. 

(DSC01278 (Medium).JPG)

DSC01278 (Medium).JPG (66KB - 976 downloads)