Jim:
Not sure why you say trailer tires do not need balancing while truck and car tires do??? What it different that trailer tires do not require balancing???? please explain??? I have balanced all tire from Truck to Rv and never had an issue?
Of course you have never had an issue. I stated that balancing trailer tires is not required, trailers have no steering tires to transmit vibrations.
The front tires on your car or truck are connected through linkages. "Out of balance" tires phase in and phase out through the steering linkage. When the tires are in phase the vibration is not noticeable, but when they are out of phase they can shake violently.
Balancing only occurs in one plane, since your trailer tire is fixed on it's axle, and it has no mate to phase in and out with, the physics holds the trailer tire on the the correct plane, balanced or not.
Trailer wheels are "LUG CENTRIC, and if balanced, they need to be balanced by BOLTING the wheel to the balancing machine, most automotive shops only have "HUB CENTRIC" balancing equipment. If your trailer tires are being balanced utilizing a "hub centric cone", they are not likely balanced anyway. It's up to you, but I don't pay for balancing a trailer tire, and I do not notice any problem.
BTW my G114 and HiSpec Mod 3 rims were mated in such a way that they were balanced without wheel weights.