radials will out perform and out ride a bias any day. I'm running radials on my '55 with more or less stock suspension, I've added fron and rear sway bars, spring liners, and a steering stabilizer, it rides and drives just fine. Bias would be ok for a truck that's not used as a daily driver, but if you plan on driving often, opt for radials. In addition to the performance/ride quality, radials last longer.
