new liftgate struts are fairly inexpensive at First clue I had any trouble with mine was overnighting somewhere very cold and when I hoisted / flung my hatch up and stepped inward under it, I got solidly hit on the head as it collapsed. New struts won't have any trouble with a trashbag added. As long as you aren't putting firewood in it.

$20-50 for the pair, depending on your brand / perceived quality preferences,1404