The front bumper spray tank on the lawnmower works way better than expected.  I can spray and move along the fence lines, justing my left elbow to steer with the wand in that hand.  Or drive slowing and steer with one hand.  
At first, I only put in 12 gallons of water & Eraser A/P.  Every once in a while the rear tires would spin.  I was extra careful along the gully.  Last trip of the day, I put in 16 gallons and all worked fine.  Now, after all that fab. and install with 3 hours of spraying.............the tank will sit until next year.
                    hugs,  Brandi