I'm not sure about the "-T", possibly Tipper/Dump? I haven't really studied the transfer case and dump controls to be sure how they work (and to be sure if they are the same for all versions of the dump truck). The PTO is at least similar to the one used on the winch equipped trucks that got a -W suffix but without the actual winch. I'm not sure if there were other chassis differences to justify a separate identifying letter, or if there was a difference in the cab floor to allow for mounting the dump controls.
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