Junk Man,
IMO, your best bet would be to begin with a day cab with the wheelbase you need. If you add
three or four feet to the back of an existing sleeper, that will throw off the balance of the sleeper air bags. The back end of the sleeper would extend way beyond the bags. This would affect the movement of the sleeper and I would think, cause some instability for the sleeper.
onezman
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