The best way to carry beaver is not to. I use plastic sleds year round. They drag a whole lot better on snow, but ok over logs on leaves etc. Getting close to 70 so dragging makes a lot more sense. Brings back good memories of taking 34 beaver on a one mile stretch of track in a few days a while back that didn't bother my back, but gave me the hernia. Was plowing through muck that was over my knees in the dark without a light breaking through an inch of ice. Beaver on my back with a pile in the sled. After the first night I planned on getting in earlier, but didn't. Good colonies, one had 15, the rest were 8 to 10. Was at the peak. Another guy got 6. Very good week, managed a triple on otter too. When I first got there I set about 6 traps going in and had 2 beaver coming out. A land owner wanted a good one to mount. Got him a 59 pounder in a few hours. I use a 2 foot wide sled for my oversized cages or carrying 2 of the standard cages side by side. I have beat up 18 inch wide sleds for the standard cage that hold no water. The good one is like pulling a boat a lot of the time, very easy.

I can pack out more $ worth of chipmunks than beaver!

Impossible to pull a sled here in beaver country with all the criss crossed blowdowns and or old burn blowdowns.You would be unloading and reloading it every couple yards in some places,lol.A man can carry a lot of weight without much effort if you have a good tump strap.
In the old days each man on the canoe brigades were supplied with one portage strap and were charged 3 prices for the loss of it.The straps were very expensive and only a limited number available for trade.And everyone wanted them.

What is a tump strap, Boco?

It is a strap that attaches to your pack near the shoulder straps and goes around your forehead for carrying extra heavy weights on your back.

Ok, I've never seen such a strap. I'm not even sure where 1 could be purchased. You are tough to haul out as many beavers as you do