At the high end the tractor would weigh 20,000lb total.
Most steering axles carry about 11,000lb unhooked leaving about 9,000lb on the drives.
Commercial regulation (not really applicable but good reference) put tandem drives at 34,000lb max in most states, leaving you with 25,000lb of rear axle carrying capacity.
I don't think there is any way you could build a 16ft or even 22ft conversion that heavy.
For reference my Haulmark with a 35ft box with 2slides has my rear axles at about 25,000lb dry.
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2007 Haulmark 3329DS, Freightliner Coronado Chassis, 515hp Detroit, Meritor Freedomline 12speed Autoshift, 10kw Generator, In-motion Satellite.
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