Perhaps someone can clear this up for me, but WHY in the world is seatbelt jamming such a common problem?
You'd think they could design a buckle that would still function after an accident.
I think it's just inherent in the mechanism. On my Jeep's factory seatbelts, if I get the Jeep leaned over far enough the belts are extremely hard to get off. Plus it might have your full weight on it also. And then they are impossible to put back on due to the fact that they retract and won't come back out.
This is why I'm buying and installing racing harnesses in my Jeep for offroading. They are non-retractable and a heck of a lot beefier, plus they are specifically designed to be easily unlatched after an accident.