F-series quarter window replacement glass?

[Andertusa]

I'm sorta in the process of acquiring an F800 with a wheelbase similar to that of a school bus. Anyway, it has a crew cab, but I'm interested in adding some to the cab, like two sets of Supercab quarter windows, to really fill in the area between the cab and the rear axle; and also to add some space to use as a 'sleeper cab'. The truck would be used to tow a heavy camper, like one of those 14,000 lb BEHEMOTH campers. I'd like to do it all without really hacking off what I want from other truck cabs, it's too much waste. Anyone know anything about replacement tinted glass?

 

[Andertusa]

I have a CDL so that's not really much of a problem, but I'm finding it hard to find the quarter-window glass by searching online, it's like I'd need to either hack the cabs off of perfectly nice cabs, or fab everything after the doors.