To add, anyone who’s seen a bouncy out of balance tire on a vehicle, raise your hand.
Anyone who has felt that sensation in their own vehicle and having the wheels balanced cured the problem, raise your other hand.
Ok now that most people have raised both hands….put them down.
How many have seen a bouncy out of balance trailer tire/wheel? raise your hand again.
Im sure some, maybe half, depending how observant the responders are, raised your hand.
Now who’s SEEN their own trailer tire bouncing from improper balance? Raise your hand.
Ok I’m sure that last one was zero or very few. And only if it happens to be a front axle wheel and way out of balance.
Point made.
Just because you can’t see or feel it, doesn’t mean it’s not happening.