No, things can get pretty crazy wrt road haulage here in WA.
I seem to recall that 200T Gross is the maximum on prescribed road train routes - Fenix is hauling 140T of iron ore per trip, netting 340,000T/quarter - but the two variables there (the weight of FeO2 vs Si, and the much greater haul distance) mean our equation would be somewhat different.
I'd wager there's some interesting discussions going on in the background; to invest in a fleet of trucks dedicated to hauling mineral (silica) sand, any trucking company would want to lock in a long term contract to pay for the capital costs of the trailers - but with the promise of rail infrastructure in the future, Cinnabon would not want to lock himself into what is a more expensive per tonne road haulage solution for any longer than is absolutely necessary.
Not to mention the lead time to build those specialised road trains - currently 24-36 months for a single custom heavy haul float, so I can't see specisiled road trains being available any sooner. That means using whatever fleets exist now, which may haul 140T of iron ore, but would not get that tonnage of silica sand in the same trailer bodies.
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