If it was me, the first thing I would do is weight the axles and find out what your capacities are
Then determine if you need/can/should modify the frame length.
I say this with experience as my first Freightliner 256"wb with 12k front was close to capacity with an empty 4400 lb van body on the frame rails (that little exercise cost $70k by the time I was done)
Your overhang appearance is strictly your preference. My conversion has 5 feet from the rear tire to rear wall, some have more some have less.
The truck also has a 16k front axle and fully loaded it still has room for more weight upfront but not much.
Good luck with your project.
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