John
While the ARGO and similar ATV type vehicles are great for land conditions, I have found them less than ideal to use as a boat or water transportation. They will work on the water, but slowly and have certain disadvantages, as you have found out.
To get IN the water is easy, but getting OUT is a lot more of a challenge. With all your firearms in your collection, and your constant purchasing of more and varied types, might I suggest you buy a Harpoon Gun and mount it on the front deck. An alternate would be one of those rocket propelled grappling hooks. You could launch it at the landing site, and having the end attached to your winch, use it to get out of the water.
Seriously, I can visualize your plight with the Argo, and next time I am in Wolverine, I will have to tell you a couple of amusing anecdotes in which an Argo, a Skunk, and stuck-in-the-mud footwear was involved.