Centramatic Wheel Balancers

This subject is concerning me in realtime right now. As some of you know i just had my 19.5 vision wheels and Dyna trac pd 890 16 ply 245/19.5 tires. Ordered and delivered from wheelrack. They come match mounted, weight balanced, 2 balancing bead bags. Firestone near me mounted new wheel/ tire combo for free, know the manager, and he asked me if i wanted him to check balance with road force and i told to hold off and lets see how they felt for a little bit. Well a week of driving with camper loaded tires felt great but never got over 55 mph with them. Packed of for trip Dw, granddaughter and I and after during 900 mile trip so far i am experiencing vibration and shimmy when truck gets over 58 a little. Set cruise to 62 not too bad just a little shimmy in front end and steering wheel. Alignment is good. Increase speed to 64 to 68 and it is pretty bad . One of these tires is off balance. I am in KOA in buck eye lake east of columbus Ohio. Anyone know a good place in Ohio to take truck in that deals with these commercial tires? Really like to take care of this before getting back on road to upstate new york.