You got to think about what kind of 'wheeling you do and what you want to protect. If you want to protect your precious windshield, you'll need one of these hideous-looking external rollcages. Whether they really protect anything is anyones guess...
The most common off-road rollovers are having the jeep go on the side, often in slow motion. A rollover over the front is pretty rare, but has a lot more energy to destroy anything. If that happens, the windshield is going to be the least of your worries...
If you get it on the roof, the main worry is to protect the occupants heads from rocks, tree stumps, limbs etc. sticking through the rollcage. That's why the spaces you talk about are a bad idea. Others even cover the top of the rollcage with metal netting, etc.
To me it looks like there is a seat mounted in the bed, which is probably one reason for the rear bar.
JJ
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It looks to me the windshield would be busted up if the roll over was over the front. Yes? Has anyone had this happen to them?
Also, in that first pic, would the back roll bar really be needed?
I'm thinking about this kind of option as I want to put the CJ8 half cab on my CJ7.
Another thing. Back in the "days" we used to go hunting in the jeep. It seems we always liked to stand up in the passenger seat to get a better view of what we were going over. Therefore I would think I would like spaces in the roll cage to allow for driver or passenger to stand up at any given time (not necessarily during rock crawling but at other times). With the cage in the pic it would be difficult to stand up.
Any feedback on this idea?
Thanks,
Bill