Something to be aware of -
I just heard about an aquaintenance of mine - he's in the hospital. He rolled his Wrangler - in a fairly easy gentle roll.
He flopped around inside, ended up with his stock seat belt and shoulder strap stretched around him.
He'll live, but may not be able use his legs anymore.
As you know, the stock belts with retractors only tighten during an impact - this roll wasn't a hard crash, just a roll down a slope. The retractor let the belt slack, he banged his head on the roof and bar. Then, the belt got around his neck and nearly choked him. When they pulled him out the belts were fully extended! He'd possibly been better off without it!
The only belt that would provide that kind of protection is NOT the kind with the retractors. The retractors are intended to lock up in a quick jerking motion, a roll does not always do that - at least at first.
Try it - lean forward - it doesn't hold you - trust it?
Think about it!
And - caution - a single lap belt causes what they call "jacknife injuries, where the body gets bent too far and the head impacts things.
Racing type 4 point double shoulder harnesses are dangerous too - you tend to slide under them just a little, the shoulder harness pulls the lap belt up above your hips into the soft area - where internal injuries get you.
Only the 5 point type - with the submarine belt between the legs is the safest. The sub belt keeps the lap belt down where it's around your hips - the strongest part of your body. (No, it doesn't hit you there.)
But the Feds won't approve the 5 point belts because most folks won't bother with the submarine belt - just too much trouble.
The next safest belt is the cross shoulder belt -- but without automatic adjusters or retracters that can let it unroll gently. The belt must be tight, slack's a killer too. Manual adjustment only!
Just thought I'd pass this on - I'm revising all my belts ASAP!