I have a similar set up, but for now, my are separate. I have thought of bypassing the 10w controller in the suitcase and connecting to the 30w PWM controller for the efficiency of having the controller close to the battery bank. I suppose with a little ingenuity you could have it both ways by having a 2-pole plug at each controller. Just plug into the controller of choice. Leave the original wires but make a separate long 30-50' cable with connectors at each end for the run to your MPPT controller. That gives you more flexibility for locating the suitcase panels in the sun while you are camped in the shade.
