It`s amazing how we tend to stray from the original post - I invite everyone to read the original post again, and then answer objectively. There is little point suggesting a Nacra/Inter/Prindle/Taipan/Turbosquid catamaran, given that T55 asked a really simple question, and it gets repeated in the heading of the post EVERY TIME someone writes a response, but none of us are reading it.
A simple choice of 3 boats, given his specific needs.
None of them are the perfect boat for these needs, given, but which one will satisfy all his needs reasonably well??

-Wave : I`ve only seen photos of these, but they look tiny.
-Twixxy : Checked out the web-site & specs, also doesn`t look big enough.
-Hobie 16 : Also not quite big enough to handle 2 large guys with camping gear, but I`ll assume that he`d rather take his girlfriend camping than his 200lb friend (I could be wrong here !) in which case the H16 will cope, but not be as good as all the other boats you guys have recommended, which he can`t get hold of.

He has a choice between the above 3 boats, for me it`s clear as day that only one of them will be reasonably adequate. And with his needs in mind, unfortunately there is no beach-cat, or dinghy for that matter, that is large enough to do what he is asking, and be car-toppable at the same time, so you`re gonna need a trailer either way.
Since you`re looking at Hobie-made boats only, perhaps you should be asking this question on the Hobie Forum, where the Hobie-haters seldom lurk.

Cheers
Steve