[speed220mph]

Although it doesn't seem to be a factor unless the wheel bearings are marginal, calipers mounted to the rear of the spindle centerline unload the bearings under braking and vice versa with front-mounted brakes. But as Bob says, it's more of a packaging consideration. Rear-steer setups have front-mounted calipers and the opposite for front steer. We did have a short-track stock car with rear steer that experienced right-front wheel-bearing failure when we ran it at a particular high-bank track that required hard braking for turns one and three. The cure was to install bigger wheel bearings. We never had a problem on that track with front-steer cars.