On second thought, with regard to clearance under the galley door, the AT might sit higher than the 459, can't remember. The most challenging place we have taken our trailer was while camping in the Maze district. With the beefier suspension our stuff didn't get bounced around nearly as much as...
My husband and I are about the same heights as the two of you. We have plenty of room in our AT teardrop (same size as 459). It would not be comfortable with both of us AND a husky! I can't answer the RTT questions, although our fan does not stick up past our roof rack. With the galley door...