For what it's worth, I'm 6'2" and have plenty of leg stretch-out room driving our Ford E450 based 24 foot non-slide Class C. The dinette seat-back right behind the driver's seat folds down so that the driver's seat-back can tilt well back at the same time as the driver's seat itself being slid all the way back. When cruising down the road during conditions where it's safe to do so, I can even place my feet in between the pedals for exceptional stretch-out length. What you get with the Ford engine doghouse extending so far into the cab area is a shorter protrusion of the hood so as to keep the overall length of the vehicle as short as possible for both delivery vans and Class B/C motorhomes ... all this with the big V10 engine still fitting, as opposed to only a V8, or inline 5-cylinder, or in-line 6-cylinder.
This driver's seat situation is probably fairly common with non-slide rigs. Ours is also a "widebody" design so that slides are not entirely needed in order to have enough room to be comfortable for most non-full-time camping. However, it's height is about the same as many Sprinter based Class C rigs, but the wide rear dually stance of the Ford chassis provides additional stability in cross-winds, in curves, and when being passed by big rigs.
There is a need for narrow, but still tall (for cargo volume) delivery vans and box trucks in cities. But for the more open road situations of RV'ing, the added lateral stability of a generous track can have advantages.
