You can probably get by without a booster for the brakes on the rear of a pickup. What I would do is put an inline residual pressure valve (2#) in the rear brake line to keep the caliper pad close to the rotor and cut down on the volume of fluid needed to engage the rear brakes. Then one will need an adjustable proportioning valve to dial in the front to back bias so neither locks up before the other. As stated it's interesting.
