There was a truck in Minitruckin Magazine done by K's Bodyworks in Japan. It was in a club named Outer Limits. The truck was called "Toy Soldier" and it had a rear disc conversion using Previa parts. The rear brakes on a Previa are kinda different. They are discs but inside the disc, or the hat, there is a drum like brake that works as the e-brake. And the calipers are used for the pedal brake.