i have heard of the load sensing type of brakes where more breaking power will be applied to back breaks when there is a load on the vehicle funny thing is i have only seen this system on late 80s early 90s toyata pickups.... as if there gona have much of a load on 'em
with the hole diagonal style i'm not really sure how it would handle on a vehicle with a heavy load its main thing like Hotrod said the rear brakes on most modern cars are so small that they really don't do much breaking, if you had to stop a new car with just the back breaks... you better bring along another pair of undershorts
me personally i think i'd just run the split between each axle that design has been used for years and years, and far as i know most big trucks with hydraulic brakes still run that design so....
Nate