Does chassis make matter for parts?

I'm in agreement with tatest, I'm hesitant on purchasing any Pro-master Ram motorhome chassis, since it's basically a Fiat and a lot of cost cutting is evident. I still remember the Phaser and Pulsar motorhomes based on Renault truck chassis years ago, then Renault left the US market and parts became scarce. Fiat has left US market once before and we saw Daimler Benz unload Chrysler Corp after a somewhat short merger. But yesterday we saw one of the new Fiat 2 seat roadsters introduced to the US market to combat the Mazda Miata, which we have one, I was very impressed with the design.