I've yet get my own A.I., but I tried to shift a mate's A.I. from the top of his car (Daewoo Nubira wagon) and I was astounded at how heavy it was - I didn't dare attempt to lift it off (in the same way i used to with my Revo).
I'm also curious as to whether it's possible to carry to A.I. inverted on a set of Rhino Aero racks - how far down do the AKAS mounts protrude above the hull?
Mike, the whole thing gets much easier if you use a Rack and Roll loading bar: http://www.rackandroll.net.au/
I carry my AI inverted on Rhino Aero racks on my Forester and they clear the roof OK, even when inverting the hull. (The boat needs to be loaded onto the the racks upright, then
flipped over.) I imagine it varies from car to car - the Forester has rails to mount the roofracks on, so that would provide more clearance than say, gutter-mounts.
A lot of people prefer to carry the boat upright on cradles. I must admit that if I had it to do all over, I might go for Yakima roofracks, so I could use the Yakima Mako cradles, which enable you to carry two boats fairly comfortably, as augaug has demonstrated.