When I bought my first new horse trailer, it had no wheel balance weights. I asked the dealer (owner) about balancing and the response was "trailer tires don't need balancing; it's just a waste of money."
I bought tire and wheel replacements later for this trailer. This is what etrailer.com said when I ordered them. "At etrailer.com, our tire and wheel combinations are mounted so that the high heavy spot on the tire is aligned with the low light spot on the wheel. This provides adequate balance for trailer tires."
When I bought a new horse trailer a couple of years ago - same brand, same dealer, same person - the wheels were already balanced. "A smoother ride for the horses," said the dealer.
Now I'm in the market for an equipment trailer. I've been to a few dealers and noticed that most of the new trailers I've seen do not have wheel balance weights, but some do. By not balancing, the manufacturer pockets a tiny bit more profit, I'm sure.
My common sense tells me that wheel balancing is a good thing, but what's your thought on whether to balance trailer wheels or not?