As much as I hate to admit it I run Chinese tires on my trailer. Brand is Hi-Run. 3 ply sidewall, 16 ply rated, 4000 lb dual at 100 psi. Roll easy and true. So far had good luck with them. They would be pretty harse on a pickup though.
On my goose neck (30',32') dually trailers I run 225/75/19.5, I got a bunch of 19.5 8 on 6 1/2 GM bread van rims a few years ago, I had a local machine shop cut the centers out to 4.75" (to fit Dexter 10k and 12k axles) and I cleaned them all up and painted them gray.
I had about 10 left over from a F550 I put 8R19.5 on, they are much better then 235/85R16. They are more stable, less heat and are rated @ 3950#'s single and 3750#'s dual.
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