I have the same model as well in my Adventurewagen. I had it re-done at Rocket Ceramicoat in Abbotsford and it rusted again in a year or 2
although it did look really nice when freshly done.
can't remember what service it was (whether or not it was actually ceramic coating) as I had many pieces done and not all were ceramic coat.
Anyway, the owner did give me one interesting piece of advice. He said that the black pot supports are Porcelain coated and that the finish on them is superior to any aftermarket coating one could put on top. As such he refused to coat them and said that anyone who offers to doesn't know what they are doing. Not sure if that's true, but thought I'd pass it on. Not exactly good news if you wanna make them shiny and smooth..
Good luck. Looking forward to seeing the evolution of your bus. I've seen it a couple times at the swaps. I really like it. I'm doing somthing similar with under dash fans. Steve.