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I wouldn't say welding is a necessity, as welding is not inherently stronger. Most racing safety equipment, like roll cages and 6 point belts are bolted in. However, they have massive backing plates to spread out the load.
Ok, guys. I have a pretty high tolerance for bending safety rules. If fact I would like to do something similar in my ext. cab pick up and that's why I'm here. But No. TorkLugnutz, this is not safe at all. You need to stop using it.The bolts and washers are not braced nearly well enough, you need a massive backing plate, preferably one that is welded or bolted to the FRAME, not the sheet metal, those bolts will pull straight through the sheet metal. Second of all, climbing carabiners are not a good replacement and those don't even look strong enough for climbing. Lastly, the eye bolts are not even welded shut! they will pull apart in a crash, completely releasing the harness. There may be a safe, albeit not legal, way to do this, but this is definitely not it!
Steel Etching and Marking from a DC Adapter