If you are mounting anything to the teardrop wood structure itself I'd want John to advise about the structural load and vibration issues you might experience bouncing down the road.   Here's a thought too about mounting on the trailer and using a cargo shelf on the front so you can mount the AC unit on the trailer in front of the teardrop and still have a storage box.

http://www.climaterightair.com/applications/rv-trailer-air-conditioning-and-heating.html

   Thanks I had some of those concerns too....another option I contemplated after reviewing the study plans was mounting it on a second platform - in other words a 6-12 high "box" would be built on the trailer first (using lightweight/traditional teardrop building techniques) and then mounting the camper shell directly to that.  What it would provide is a significant amount of storage.  

Contemplating some ideas.  A/C is critical though and have to address that first.

thanks for the input.

J

I saw the rooftop load published somewhere on this site able to carry two CLC boats easily.  One boat and one AC unit should be about equivalent.

Additional stiffeners may need to be added fore/aft and athwartship to distribute the load.

   My build and how I made a slide in AC THAT IS REMOVABLE......

http://www.tnttt.com/viewtopic.php?f=50&t=57906