I just got a quote for a local company to stretch my GMC 6500 4' between the cab and the rear axle of $2700. That is basically just frame, and add one section of driveshaft. Mine is hydraulic disc brakes, so lengthen the brake line and wiring. If anything the air brakes would be easier, nothing to bleed, but more money in fittings.
There are companies out there that specialize in that sort of thing, but I just found a local company that builds new roll backs and tow trucks and they can do it. I would think in any major metropolitan area there would be a company that is a body installer that can handle a frame stretch. I would think a limo company would not be my choice, they don't deal with anything as heavy duty as a class 8 truck.
I found a company a while back on racing junk that was advertising a 14' toterhome body built on your chassis for about 17k if I remember correctly. I could not find them when I looked just now. I'll post a link if I find them.
Good luck!
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