The reason I bought a C was that it is on a van chassis. For the ease of having repairs done while on the road full timing. And the safety of having a nose on the vehicle and no huge large windshields to implode on me with a simple 20 mph impact accident.
If you break down on the road any and all repair shops and chevy and ford dealerships will work on it also because it is nothing more than a van which all have experience working on.
I found most repair shops will not take in a Class A. That leaves you with places like CW, RV dealerships and the like which you have to leave it for weeks on end and pay exorbitant repair rates.
The first time I broke down when I called the nearest repair shop I said I had MH. They just about hung up on me until I told them it was a Class C on a van chassis! I know start my phone call with, it's a Ford E450.
As far as any difficulty getting from the cab to the back. If you think about it when you park your MH the first thing you do is get out the door to hook up. Then its walk back in the side door. I've never had a reason to go thru the coach first. And again depending on the model dictates how much room there is.
That said I noticed different models had different height step ups from the cab depending on the model. Which also affects how far you have to reach to the cab over. Something to take notice if it of interest to you.