Ninerbikes - yes, I would sell existing 120+120+50 panels and get 2 new 120W. Or, better yet - 3*120W if they fit. Or 2*140. Or 3*100. Any of these choices would be better than existing old-ish 2*120. With existing 2*120W the OP is under-utilizing a very good controller.
I would not rush trading a good MPPT for a PWM. Rogue quality and features are outstanding. With a few identical 12V panels in series it will work fine.
I would not buy Rogue - or any MPPT - with existing 2*120. Small camper, budget considerations (otherwise why keeping old panels?) would lead me to some PWM in this case.
OTH, if the goal is getting maximum energy out of the existing roof real estate, I would get multiple identical panels and then either MPPT or PWM again, depending on the roof layout and on panels voltage.
There is something to old concept of doing it right the first time.
