Here's my two cents on this since there was some light "encouragement". I strongly suggest using components that are designed for at least double the weight you think will be there. I'm talking specifically about whatever you use for a hinge as well as a latch. By the time you get a spare tire and jerry cans on your swing out there is a LOT of weight back there and it's all on a big lever and will put MUCH more force on your hinge and latch than you think.
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There are lots of quality hinge kits out there. Get one. It will be worth it and if it works with your design get one that is dual shear if at all possible. I have a single shear spindle type hinge on my Land Cruiser swing out and it's worked just fine but I've been surprised by the amount of wear the bearings still get. I've also see several spindle type hinges break off at bad times on the trail. A dual shear hinge will make that very unlikely unless there are bad welds holding it on.
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Personally I recommend Comp4x4 hinges. They have lots of different designs that should satisfy just about any bumper design. Check them out here:
http://www.comp4x4.com/Tire-Carrier-Hinges/
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I am using two of their dual shear face mount hinges on my personal bumper on my Tacoma and have built another bumper for a guy in Virginia using the same one. It is a stupid simple design with upper and lower plates, and huge 1" bolt for the hinge and oil impregnated brass bushings. They are strong and very worry free with no need to worry about bearings etc.
http://www.comp4x4.com/Tire-Carrier-Hinge-Kit-Dual-Shear-Face-Mount.html
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On the topic of Latches. This is a weak point of quite a few bumpers I've seen out there. The u-bolt that is used on a lot of the latches people use will fatigue over time and smaller hinges (even though they seem like they are strong enough on paper) this ubolt will bend and break. So don't buy into the idea that the latch really doesn't have to hold that much. In reality it doesn't have to hold that much weight, but the forces it will see bouncing down rough roads and high speed will cause major grief. I have been using (and I recommend) the 2000lb capacity latches from either McMaster Carr, Carr-Lane, or Destaco.
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Another thing to keep in mind is that you will very likely add more stuff to your swing out over time, whether its a hilift, a cooler rack, a stove shelf.....yada yada. It's just another reason to use heavy duty components and choose the materials wisely as well. Tire carriers span a pretty large gap across the back of a truck and they will flex a lot if the material is too light. I think 1/8" wall is the lightest material that should be used. Another way to keep the flexing down is to do a shorter swing out that only goes half way across the back of the truck, or to do dual swing outs. Single full width swingouts will flex more unless heavier material is used.
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Here are some photos of the dual swing out on my Tacoma. It carries my spare, a hilift, and has been used for Gerry cans, but I have since removed the Gerry can basket and it has been replaced by a smaller ammo box that carries recovery gear.
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Here's a decent photo that shows the hinge I'm using.
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When I first built the bumper I only had a single swing out for the tire that latched in the center of the bumper.
When I added the second swing out, I didn't want to change the way the first swing out latched, and wanted to avoid needing two latches. I used a plate on the end of the second swingout that closes first and sits behind the arm of the tire swingout. That way when it is latched it clamps the second swingout closed too.
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I didn't like the dynamics of the truck with the weight of the Gerry cans on the back so I cut that off. The first change was to use it as a spot for my CO2 tank.
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I felt like the tank was not protected enough if that location so it got moved to the bed of the truck and that's when I went with the ammo can for recovery gear. This has been the setup that I've settled on.
