In the bed of my 79 GMC Jimmy the carpet in the bed near the back gate is getting wet. I noticed that there is some condesation on the inside of the fiber glass top but it would not be enough to generate the extreme amont of moisture on the carpet. The drainage holes in the bed are out but it doesnt seem that they are big enough to let this much water through. There is no rust in the bed. I am stumped. anyone have any ideas. 79 Jimmy, 5" lift 35 M/T with a 383 puttin out 400hp and 450lb/ft. Locked front and back.