Spacers that big should be illegal. They make deadly dangerous changes in the suspension geometry, cause all sorts of unpredictable handling problems in turns, and create unsafe wheel bearing loading that threatens to break axle shafts and cause front wheel bearing failures. They also make the old trucks look butt-ugly with the wheels sticking out of the fender wells!
Other than that, go for it, but please invest in a trailer to haul your truck to and from car shows. That way you won't be a hazard to all of us who have to share the public roads with you!
Jerry
