I have never towed a 4wd myself, but I'll share what I learned from towing my 2wd from Georgia to Arkansas.
It really depends on the method of tow. Are you using a dolly?
Either way, you will need to disconnect the transmission from the axle(s) in one way or another (drop driveshaft). If you let the transmission spin while in "Neutral", even for a short trip, it will build up all kinds of heat and boil your transmission fluid out of the vent. Trust me, I've been there, done that!
If you're using a dolly, put the front wheels on the dolly and drop the rear driveshaft.
The Black Beast 5.0
Better to Have Horsepower and not Need it, than to Need it and not Have it!
2000 Ranger Sport - 5.0L V8 - 8.8 LS rear