The problem with the JKs isn't the hinges, it's the structural strength of the tailgate and the way the stock tire carrier is mounted to it. My 33s, at about 90 lbs apiece, had started to pop the spot welds from bouncing along the trails.
The Smittybilt/Bestop tire carriers are the only ones that I've seen for under $200. I ran the Smitty for about 16 months. It should work fine if you are only doing occasional fire roads. I switched to the OR Fab tire carrier. It's one of the most affordable options I could find. The base tire carrier is about $500. I went with the Rotopax option, that includes two - 3 gallon fuel cans. It's available for around $700. The Rotopax cans run about $90-$100 a piece if you buy them separately, so I felt that was a pretty good deal. They also have a gerry can version.
Mike