I have one cab for two amps well three sometimes, becuase I like to run my F-50 through my Framus Cab) at least it's easy to plug/unplug the cab cable )
just make sure they know each other well and use protection
have a live in road case made for the 4 heads. give mark a holler at rock hard cases (http://www.rockhardcases,com) or mark@rockhardcases.com. they are in oregon. all custom made. he has made quite a few for me and good quality stuff.