Since they are longspring, i would have to say a definite no on the coon. If they were coils, you would have stood a chance with some slight modifications in my opinion. These traps were designed for mink, muskrat, possum, and skunk sized animals. The number 4 is used in the taking of beaver, coyote, and possibly wolf if the trap is set up right. You need to check you local trapping laws to make sure the jaw spread on the number is not too bog to use on land. Sometimes they limit you and sometimes they don't. A submerged trap on the other hand can be any size in minnesota, but only if 100% submerged. I would take those traps (since your in south dakota) and make a few muskrat floats. If you need info on these pm me and i can send you a link to numerous ideas and how to's on muskrat floats. quick, easy, and great for a first time trapper.
My mind belongs to my work,
My heart belongs to my family,
BUT MY SOUL BELONGS TO THE COYOTES!!!