op wrote:
Spoke of blow out years ago and is running GY G614 LR-G on back
The Goodyear G614 RST is designated as a regional service trailer tire which is a very popular tire for rv trailers. Goodyear has said in emails posted on rv websites the G614 RST G load range at 3750/110 psi isn't to be used on a truck/van/suv vehicles.
I would sell them to some one with a heavy trailer and go with LT tires and wheels with 15-20 percent reserve capacity above actual scaled axle loads.
The G614 is a ribbed tire which has superior straight line tracking so I doubt it could have caused your handling issues on the '99 truck. lots of other places to look on that old of a truck.