Moving the axle back is not a huge deal. Any truck repair shop, truck equipment shop (one that sells/installs decks, boxes, etc) or frame shop should be able to do it. Basically disconnect all hoses and wires from axle/suspension, slide it back to where you want it, drill new holes, bolt it down, extend hoses/wires/driveline and reconnect.
As far as 19.5inch wheels, only the dealer could tell you as it all depends on how the truck was speced when it was built.
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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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