I think I know how to fix the problem. In my 95 XLT, it was really hard for me to turn the handle to open the hatch and the glass. I took off the interior grey panel and took some WD 40 and grease and grease the latches and all the interior parts to the handle. It fixed my problem, its all due to ageing.
Put plastic explosive around the entire edge of the tailgate and blow it open. That should do it.
If you go in your cargo area from the inside, look for the lock pin. Once you locate the locking pin sticking up, there is a plastic hole next to it, you have to pop the plastic part off. Now you can see down inside, spary WD 40 and grease it. I will try and get a pic if you can not figure it out