The latching came from Toggle Clamps, and it was cheap. They make a heavier duty one that has a locking hook for double safety but could not find it on the net so I ordered the one that you see. it was $7 or $8. I didn't use their hook that it latches to but made one out of 1/4" x 1" angle and had to notch it and then welded to the bumper.
To make sure it wouldn't open You can see the handle insets into a piece of 3/8"x3/4" tubing that I notched out and drilled a hole in. Right now I'm using a lock but I want to use a friction pin tied to a wire so I don't lose it. I did this just to make sure it didn't pop open while driving anywhere.
For the swing arm I bought this item from JeepTubes.com and it's very sturdy with balbearing top and bottom. To the right of the swing arm I welded another 1/4" x 1" angle iron to act as a stop because it will swing all the way around if you don't.
I have a few more things to do to it. I want to put another set of tail lights up higher maybe off the upper rack. Not sure yet but will play around and decide.
Anyway this is what I did and it will give you some ideas for your tire carrier. Just keep in mind it will wind up fairly heavy if you are going to larger tires and mine are only 32's and then add a gas can and a jack there is some weight there. Good luck on whatever you chose to do.