truck bed question

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I just put a sheet of treated plywood in mine yesterday. It was a little work, but looks nice. I took the bed off the truck and removed all the crossmembers and the old wood and stips. You will probably have to cut some of the bolts for the strips out. Then I fit my sheet to the bed, I had to make two slots to clear the back bolt at the tailgate. Then I had to take the front panel off to get it under the lip on it. Reinstalled everything and it looks really good. I just have to drill all my holes for the hardware and its ready to put back on. I hope to put enough bolts in it to keep it from bowing for a few years. I helped my stepdad put in a sheet like yours in his 66. Its only been a year and it looks like crap all bowed up and nasty looking already. I hope to keep mine from doing that.