Have you tested them with a camera for weight on them yet?
Yep. They hold a Moultrie D6 (six D cell batteries) just fine.
But if you're concerned about weight go with a two-inch by 1/4" eye bolt instead of 3/16". It will be a little harder to screw into a tree, and you will need two Fender Washers instead of the regular flat washers because of the bigger eye in the bolt.