Transfer case in 2WD?

[TravisMartin]

I realize this is an off-the-wall question, but is there room under the floor of a 2WD cab (1978) for a transfer case? It's my understanding that the center floor on the 4WD cabs is different, but will it go?

I'm asking because I'm thinking of putting one under my 78 to make it easy to flat-tow behind my motorhome. I won't be changing the rest of the truck; just want to be able to throw the transfer case into neutral for towing. But I don't think I want to cut up the floor if it won't go. So I'm hoping someone has already tried this in doing a 2WD to 4WD conversion...

Thanks!

Travis