Generally I’ve found it is possible to do easy crossings even in the small alpaca with two people. A second trip is required for gear. And it’s not comfortable enough to go far, and it’s not stable enough to do anything interesting. I know people who have fished comfortably out of a llama as a pair.
When doing two-in-a-boat river crossings, there are two positions we’ve found useful:
-Paddler sits normally on the seat, and the passenger sits on the bow with their feet jammed in next to the paddler’s legs. It’s crowded for paddling, but works.
-Paddler sits normally on the seat, and the passenger lies along the length of the boat, head toward the bow, with legs split around the paddler’s torso. This gives maximum stability by lowering the passenger’s center of mass, and gives maximum room for the paddler to move their arms. And the passenger can tip their head back and watch where the boat is going… upside down.