You probably already know this, but just in case.
Are you going to install a driver adjustable prop valve?
I recommend you do, they're driver adjustable by the driver while driving. There are the screw type and lever type. The screw type are "infinitily" adjustable through a range, while the lever type has a certain number (5-8) of presets. The advantage of the lever type is you just pull/push to a preset and you're done.
They're very nice because you can back out the rear braking as tires start to go and fuel mass drops.
You just install it in line on the brake tube. Takes some wierd routing, but it's quite easy.
The difference between this and a bias bar is a adjustable prop valve can actually change the overall braking force, not just shift the bias.
I belief Tilton makes both.
Here's an example: