I run mainly sdc (curtains and flats) with a few montracons and Schmitz (uk spec). Sdc by far the best, I run the trailers for 11 years, and we’re doing haz fertiliser onto farms running at 44tne all the time. Never had a trailer crack in 15 years, (other than one that rolled with a fully strapped load on)
However, if I was speccing a specialist flat, go dennison or even muldoon, you’d certainly get whatever unique spec you require from them, but at a price, and not particularly quickly.
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