Ron sarz272000,
Regarding your longer twin bed inquiry, I am not sure people who are contemplating ordering a PC, understand how much linear wall is sacrificed when getting a slide out. There are two influential factors.
1) The large angled transition wall just behind the Ford/Sprinter steel cab
The dinette best utilizes the transition wall, taking advantage of 8 inches to offer a larger table and more leg room. It also accommodates taller people when setup as a bed.
2) The thickness of the slide out walls seen as the framed wood border
You will have to ask people with slide outs about the distance between their fridge in slide out, and cabinet or bed outside the slide out, but the gap appears to be at least 4 inches x2 which is 8 inches total.
So the difference between a slide out and a slide-less can be as much as 16 inches of lost wall space. So if the twin bed model you are considering is a much higher priority for you over a slide out, you can gain quite a lot of bed length by deleting the slide out.
I present this just so you understand the flip side to having a slide out. I don't understand why, but every time I bring it up, I get dinged multiple times as being unneighborly :(
Here is a picture of our dinette utilizing 8 inches of the transition wall on the right side.

Here is a close-up of the wood trim framing the slide out wall.
