How can I go about a swap? Seriously, that 31C is one of my favorite WinTasca layouts. We own a Jayco and firmly believe the Winnebago stuff is better. I mean in materials, design, assembly. More importantly, I've found I could assist Winnebago owners with electrical problems via Web and Phone, because their parts and wiring diagrams were available and SO precise.
This may not be a perfect example, but in an Automobile, you can find documentation of not just which fuse feeds which light. You can also find where that wiring runs and even order a replacement harness. I've seen Winnebago to be just like that. All the way down to the two screws that held the DVD player to a shelf. But Wiring was where Winnebago said I'd find it and was labeled. Our Jayco is more like a Stick'n'Brick house. Breaker panel MAY say where a light or outlet is connected, but there's no telling how the wiring was accomplished.
I also find Winnebago construction, evidenced by water and wiring systems, to just be "neater" than many others.
New Jayco with a fiberglass roof, possible candidate. And remember that not every Winnebago roof has been fiberglass. Maybe all the newer ones now have FG again. There were years where some models didn't.
Our rubber Jayco roof is crowned at the rear but flattens toward the cab-over. Holds a lot of water, and has leaked.
But all said, FLOORPLAN RULES! Daddy gets worked up over the engineering. Mama better be happy in the house part!