That diagonal approach scares me. Especially with a truck that might have a different load on the rear each time you drive it. Sometimes it might go straight, sometimes it might bend right, and other times dart right...
I've noticed on some pickups starting in the late 80's the rear brakes are huge, and they have anti-lock systems just on the rear. I assume that's because with the variable load on the rear sometimes you really need more braking power there than in the front.
On a 2-ton truck like Jeff's COE, complete with dump bed and an occasional load of gravel, there will be times he needs those rear brakes much more than the front, and the diagonal setup would turn the truck if one half the system failed.
