I usually travel with two suits when I'm traveling for work (multi-day meetings). I've ditched using the built-in suiters in rollaboards as they've always been space hogs and don't leave my suit jackets any less creased/wrinkled than other methods.

I primarily use a garment sleeve for folding items. Two suits and 3-4 shirts fold easily into the sleeve and it fits nicely into the "suiter" compartment of my rollaboard.

Have you ever folded a suit jacket? There's a technique where you fold it inside-out and tuck one shoulder into the other. I think there are plenty of videos online that show how to do it.