An interesting idea for a class 8 has been mentioned here before... an argosy. I didn't think it practical since it's a cabover, but when talking to TonyII, he mentioned all the basics are under the front hood, and it wouldn't have to be tipped unless there is major maintainence to be done.
With an argosy you would have a 110" sleeper, and could put on a 30' box and still be legal length. The dog house is also only 3" high. After a year or so of driving the beast I have now, I plan on seriously checking out the argosy myself. Hope this helped.