Doggy Daddy
I think the 10 degrees +- you were told, is concerning home heat pumps. That is the type of heating that you can expect out of them, without the auxilary heat unit BHD (Big Hair Dryer) coming on. For rooftop A/C units it is common to see 20 - 23 degress difference. I know that typically, dash A/C units can cool pretty good. I have a suburban that will freeze you out of there on a 100 degree day, but given the area involved in a motorhome, there is no way the dash A/C can be expected to cool the entire coach.
I guess the best answer is, use the dash A/C. If it gets too warm, fire up the generator and bring in the heavy artillery
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I have a bad habit of over analyzing everything. It's what I do for a living, and sometimes, it's hard to turn that switch off
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Thanks for all the answers and suggestions. They are very much appreciated!
Bill