Phil Jones suitcase and 2x 4B cabs

[Forbes]

I've just picked up a Suitcase (original) combo. It came with two 4B cabinets. Is there any advantage or problem with connecting the Suitcase to both 4Bs

 

[Eggman]

Can only hook up one the the Suitcase - raises output to 300 watts. You can use two 4b cabs with a separate head up to 600 w at 4 ohm