Jeff,
I had an 18' Aire Leopard Cataraft with a custom drop fame that really lowered the center of gravity.
It was made so the center section rode about 4" above the waterline when fully loaded and the end sections were raised to tube-top height for taking big rollers without taking too much water.
I put 3/4" Marine plywood floorboards all across the frame for a platform so that you could walk the entire length of the boat. A raised rowing bench of marine plywood provided not only a seat, but additional flat space to hold misc. gear.
The longest part of the frame was 6' and I could get all of it into a Super Cub except the 10' oars, which we strapped to the wing struts.
I mostly floated Class 1-2 water with a couple of Class 3-4 stretches and never had a problem. The most I ever put in it and floated a river was ~1750lb and I could still maneuver it quite easily.
A good Cataraft, with decent rocker, will outperform any oval or "D" raft, particularly on faster water.
From unloading the components on a river bank to pushing off took two of us about three hours and that included pumping up the tubes with a double-acting hand pump, assembling the frame and floorboards, and sorting and lashing everything for best center of balance.
I also built a motor mount for it and trolled for Silver Salmon in Resurrection Bay using a 25hp outboard.
Got some pretty strange looks from other boaters...
My two picks would be first, the Aire Leopard;
LINK and second, the Aire Lion 16;
LINK For just you and Caroline, camp gear and a moose, the Lion 16' would do just fine.
I have pictures of mine, but they are all prints.
Ed