$3.00 velcro strip from Wal-Mart.
Often when your on the trail and you stop&park on uneven ground or a hill, you undo the seat belts to get out. When you hop back in the jeep, you can't do up the seatbelt cause it's locked up. Tie the velcor strip around the seat belt to pinch it so it doesn't retract all the way. When your back on the road, simply adjust the velcro strip so the seat belt has tension again.
That or get your self a 5-point harness.
-Joel