I have a 97 Ford F-150 4x4 with the 8 foot bed and a hard fiberglass tonneau cover that opens up to about a 60 degree angle and is HEAVY as hell...it probably weighs a good 100 lbs. Well my shocks that "used" to hold it up, no longer hold it up and I need replacement shocks for this thing but can't find them anywhere. I need heavy duty ones for over 100 lbs so that when I unlock the latch, it props all the way open on it's own. Can anyone point me in the right direction on where to look? Thanks.