I think if I was going to put a shorter roof on a long van I would want the unused roof all at one end.
While it would not be as usable if you were going to put an RB roof on an EB I would put it all the way to the rear so I could have more unused roof space for racks and such in front. That would kill the best part of the roof witch is to have room to stand by the side doors.
What about a fixed roof? They cost a lot less and you could put a rack on it to hold all of your stuff.
Roofs like a lot of things in the camping van world all depend on what it is you are looking to do.
Brent put a new taller one on his van and as far as I know (a few weeks ago) still has the old one..
Personally I would like a fixed roof because they are always up ready to move around in but my fiance says NO WAY.
http://sportsmobileforum.com/viewtopic.php?f=7&t=8185
...Jamie