What are your priorities for a restraint system? Are you really concerned about safety, or is convenience more important?
Quick background: I testify in court about auto accidents all the time. Vehicle safety is a part of it
A vehicle's seat belt is part of a larger restraint system. Crumple zones, airbags, seat design, and of course the belt, all work together to keep you alive. If you take a stock car, and put a 6pt race harness in, you did NOT necessarily make it safer. What you really did is restrain your body much better, while allowing your head to flop about, putting unbelievable strain on your neck and spine in the event of a crash.
Back to the Goblin, we took the stock belt system and bolted it into a tube-frame chassis with no crumple zones, no airbags, and seats of unknown design. Even if you don't intend to track it, the goblin is much closer to a race car than any street car, and that means it's (probably) very stiff in a crash. The whole system is stiff, and your body restraint system also needs to be stiff to make the system work. To me, that means a harness. In a perfect world, you'd also need a HANS device to keep your head in place. But let's be realistic, you're not going to wear that on your way to the grocery store, plus you need a helmet with hans anchors on it.
Given everything I just said, I think a 4pt camlock harness is the most convenient and "safest" option for the goblin. I bought some off ebay and they worked great, but I ended up swapping them with a 5 pt SFI rated harness for track days. I don't think it's much safer, it just costs more and now you have a strap on your junk. Obviously different people arrive at different conclusions, as every goblins is different. But from an engineering/safety standpoint, I'd go 4pt camlock.
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