To me, there as "Small" "Medium" and "Large" Class C's, "Super C's" being another group entirely.
I'd call "Small" up to the 24-footers and many are on Sprinter chassis. I think part of why people love Sprinters is that M-B doesn't allow them to be stretched into the "Medium" size which would tax all their systems and capacities.
In USA, "Medium" (25-28) AND "Large" (29-32) are on pretty much the same chassis choices. Namely Chevy 35/4500 and Ford E-350/450. Compared to Sprinter, they're low-budget chassis AND both GM and Ford allow them to be stretched up to an extreme maximum that assures an at-or-near overload condition. And a lot of us aren't happy.
Some of the C's that Robert posts seem to be on chassis that can put at least the "Medium" C's on a Diesel platform. And there are bigger ones, too, that seem to my eye to blur the distinction we have in USA between "C" and "Super C."
@Sully2's thread that's a hybrid Gas vs Diesel/Small vs Medium-Large, it'd be nice if something like that Daily was available for Class C's here. It'd narrow the price gap between Ford/GM and M-B chassis AND let the buyer have a choice of IVECO/Ford-GM in a wider variety of coach sizes.
@Bryan about Promaster. I'm not ready to endorse that one. They seem to be built right at max capacity. A couple can overload them at the rear on a weekend outing. The rear overhang gets extended without stretching the wheelbase one bit.
Ford Transit looks like a prospect here, but from what I've heard they don't offer diesel in the cutaway...? Hope I'm wrong.
From a historical perspective, I wish the E-550 (that's right Five-Fifty) had taken hold and continued. That straight front axle with bigger brakes and 19.5" tires would be good handling AND turning radius in the "Large" C's. Blur distinction between "C" and "Super C."