I think Ford is upgrading the dash systems in the E series chassis this year or next year, so in a couple of years some of these sorts of things may start appearing--at least adaptive cruise control. Rear cross traffic presumably relies on a backup camera, which my not be integrated into many class C's (at least with the factory systems); similarly I don't know if the sensors needed for blind spot monitoring would be included. If you don't have convex mirrors, adding a stick-on one is a tremendous help in checking blind spots in ajacent lanes.
The Ford E series is not generally at the cutting edge of vehicle technology; things take awhile to trickle down there. My '98 lacks a good bit of advanced vehicle technology, such as the dash mounted glove box and the digital odometer display, but it does get me where I want to go reliably and in reasonable comfort.