IMO Lynn you are right on. Sometimes it is the wheel and not the tire. 4 weights were used pretty much in the old days at good shops. Trial and error with the nylon thumpers. Also, I hope you guys are not getting carried away with balancing wheels on a car that may really be a trailer queen? Almost like dynoing an engine that is not going to exceed 2,000 rpm's or ever get out of second gear.
