Re: dogs - we generally travel when it's not 100 degrees out, so our dogs have always been safely cool in the motorhome with just an overhead fan exhausting heat and a couple of windows cracked open. A Fantastic Fan or MaxxAir fan can run all day and not deplete the battery; and assuming your RV is a lighter color, should stay cooler-than ambient temps.. The dogs always have fresh water available of course.
The longest we ever left them was in Alaska, for 7-1/2 hours while we took a 1/2-day wildlife-watching boat tour. We took a LOOONG walk before we left - they were still sound asleep when we got back :-)
Re: door height - our old pole barn's door was 11' 5-1/2" tall. Our 28' Class C was 11'6". The driveway was gravel, so we dug out enough ground that the A/C unit passed under the door frame before the rear wheels started to rise back up onto the concrete apron. I hope that makes sense? Certainly was easier than replacing an A/C (assuming you don't have a concrete driveway)
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