Any suggestions on keeping the coach cool for passengers during the summer other than keeping the engine A/C fan on high and running the generator to use the roof unit?
The one suggestion I would make is to fire up the generator and the roof AC's BEFORE the coach starts to really heat up. It always seems easier to keep it cooler that way than to wait for it to heat up too much.
It also depends upon how hot it is outside. If your in the desert in the middle of the summer, start with everything on. Remember, your AC will only cool your coach down to about 20 degrees or so cooler than it is outside.