Charlie,
Each coach is slightly different, based on the weight, loading, etc. What you have to be aware of is the height on level ground with air bags fully inflated. For my Jeep Grand Cherokee the hitch is perfect with a straight line, when I tow my Dakota I have to insert a 4" lift receiver to get the hitch level. My sons CRV needs a 2" drop to make things level.
No quick all for one answer.