My point was really that there is a difference in the manufacturer process among these products - they are not all equal and there are charts that show the comparisons under stress and heat tests. I will go and find them eventually
My other point, and I completely agree with you, but every single one of us knows people who use the spacers/adapters and we don't know anyone whom we regularly talk to where these adapters have failed, let alone people we know personally know. There are literally thousands of Jeeps and Toyota's running these things on ALL 4 wheels. What i'm getting at is that... we go with the option we are most comfortable with. Some use the 1/4" slabs, because they are confident they will not fail. Nathan has never seen or known anyone with failures with his spacers, so he'll continues to use them. I have never heard of anyone I know with Spidertrax, 1/4'' slabs, 1", 1.25" or 1.5" adaptors to experience failure - But I am most comfortable using Spidertrax - because that is my comfort zone despite the few failures - I've read... Dig around long enough and you'll find SOMETHING, lol. Anywho, Others would prefer to just get new wheels all together.
Also, Carlos - I do agree with you with regard to user error. Me being a grad student in environmental health - risk and hazards are my particular specialty, lol and are always my primary concerns. I don't believe adapters/spacers to be hazardous but I do know that they come with risks, risks that CAN be avoided and/or reduced. Achieved simply by inspecting them at every oil change and/or tire rotation... - I pull mine off entirely and retorque at every oil change. I also end up checking them any time I pull my tires off anyway - Simply because there're already off, might as well do it lol.
But driving a vehicle alone is a risk - lol, stating the obvious, lol.