Wheelbase needed to add sleeper to daycab 379/359

If you were to take a daycab version of a 379 or 359 and decide to add a factory sleeper to the back of it, what would be the shortest wheelbase you could do it with? More curious about a 48" flat top, but interested in all standard sizes.

Not something I plan on doing in the near future (or most likely ever), but I have a million ideas running through my head trying to think about getting back behind the wheel. One of the many thoughts involves running a daycab locally, but having a way to convert that truck to run OTR or regional should all the local freight dry up.

 

Thanks. That is exactly what I am looking for.

It's all about an idea I'm trying to think through, where honestly I am about 20 steps ahead of myself even thinking about what truck would work for my situation. But, I felt like playing around on Truck Paper dreaming about what I would like to have, should my idea turn into something real.

In planning for success you also have to have a plan in place in case you fail. Dealt with this in a previous business I had, and ended up having to shut it down because I was unable to adapt when the economy went bad and made my business model obsolete.

Daycab would be best and cheapest for what I am thinking of, but I couldn't get away from the "what if?" scenario. None of that involves any ideal circumstances, or cares what is better, only what is possible as a last resort in a situation where I had no work. Just wanted to know if some of these trucks that I was looking at, while otherwise ideal, would provide any sort of platform where it was possible to do this.