You might need to stretch the frame a bit for the trailer to sit right on the cabover.
COE loggers were used. I've seen photos of Petes, KW's, White-Freightliners, Macks, GMC's, Hayes, etc all COE's, some sleepercab, some non-sleeper. They all had long wheelbases and most had overhanging frame rails aft of the drive axles.
I'd say add an 2 inches (actual length) to the frame between the fuel tanks and the rear suspension and you'll have enough room.
Tim