Travis, I have not seen one of these, but Wow they have it all, but yes pricey. I have seen copycat units used by Forrest Service and Game Department personnel, I did not ask if they were personal equipment or owned by their departments. I can see that the smaller more affordable (?) unit drafting from a couple of blue barrels on a trailer would be within the Mule's specs and should be highly effective.
I would like the drafting feature due to concerns about clearing/cleaning the tank and pump rig when switching from herbicide to say garden watering. It would be easier to use a separate tank exclusively for herbicide.
Thanks it was fun to look at this and a great option if I can stand the price.