I, and some of the older folks on here have this:
http://www.ontimefeeders.com/pl_bumperBuddy.php
I ran a 12V line back to the rear for this device and my sprayer out of my switch panel that I fabricated.
It mounts on the tailgate with NO problems. I use it for my pastures, food plots, lawn, and in my woods where I am reestablishing ground cover. Many different kinds of seed, minerals, and fertilizer have gone through it..........Probably 2 tons per year for 4 or 5 years now...............
The company stands behind their product and have replaced the motor several times now.......They are not faulty, it's just that nitrogen is totally corrosive and eats up the motor; but the company stands behind them without questions........
Make sure when you use them that you thouroughly WASH your RTV getting all the dust and particles off as it for sure will start a rust spot........
Anyway, for me, a great product and tool.........God bless.........Dennis