You can add a second set of panels with its own controller that goes with that set of panel specs.
Then set the (adjustable on each controller with many of them) charging voltages close to the same for the two controllers and wire them both to the battery bank.
They will add their amps so it is just as good for amps to the battery as having one bigger array and one controller.
Eg, in the Class C, I have a 275w panel with an MPPT and another set of three 100w in parallel with a PWM controller. The two controllers are each set to 14.6 Vbs, and add their amps as though it was one big 575w array. I can tell they are adding their amps by seeing the amps output showing on each controller's display and then look at my battery monitor and see the total amps showing there. Kind of neat.
I had three solar sets on the C for a while, but moved one set over to the TC we got.