If you have a Class C and don't use the cabover as a sleeping area, you might want to consider something like
this.I have used this for several years and it has worked very well. The viewing angle is much better than in the old cabinet. We use the old cabinet for storage.
Class C, 2004/5 Four Winds Dutchman Express 28A, Chevy chassis
2010 Subaru Impreza Sedan
Camped in 45 states, 7 Provinces and 1 Territory