Sorry about the duplication - as I have posted the same thing on the efficient motor thread also.
In response, after a lot of research including this forum, and with the help of some very knowledgabe Anchorage folks, the Leopard is just what I may do. There are other great cata-rafts to consider (and still considering), but I have Aire products and understand their systems and have experience with any needed repair which is a plus on such a long trip. Load consists of 2 people loaded for Whitehorse to the Bering Sea - tentatively expecting a load of about 1,300 pounds including frame/people/food/gas/motor - everything. This is assuming a 60 pound 5 hp motor and 20 gallons of gas and lots of fresh water. Will outfit for sleeping on the boat as an option. Boat will be outfitted with oars of course & extra set. Trip is a planned "float" trip and motor considerd a luxury to be used to assist crossings and help with the wind - if the motor is working
Bad weather - we're off the water.
As with most orginal estimated weight plans - those figure only go up. I originally was thinking about the Lion 16 because of its advertised cargo capacity rating on the Aire website. The Leopard advertised load capacity of 1476 scared me off initially, but I'm learning it may well be my best choice for our planned trip taking into consideration efficency with rowing and motoring with a 5 hp. I'm now also aware of the Cougar, Super Leopard, and 18 foot Lion that isn't easily found on their web site. However, it may well turn out that the standard Leopard will the sweet spot for our needs. Thanks for everyone's help.