I built the featured system 10 years ago. I am still using it as needed. I have looked all these years for just such a controller but I have not been successful. Let me know if you find one. I still cannot caution you enough on the use of such a device. It is one thing to use something like this off road on the farm and another when heading out into traffic with a heavy load. The heaviest, longest, and fastest use of the device was when I pulled an M1082A1 trailer with my Dodge out of Fort Bragg using I-95 to Northern Virginia but it was empty. It even inflated the tires from 25lbs to 45lbs in the first few miles. Good Luck. Be safe.
