91 'burb cargo area mat??

[mar-tay1]

I recently acquired a 91 v 2500 suburban to use as a truck until the frame off/4x2 to 4x4 conversion is done on my 74 C20 (may be a couple years)cleaning this thing up was as much of a challenge as getting it road worthy, had been used as a storage unit for the last 5 years or so, and the factory mat and insulation in the cargo area was just foul and dirty after 30 years of neglect, so I yanked it out and threw it away. Now I'm OK with just a metal deck, but the rattles are too much for me. After spending some time scrubbing and searching looking for something loose that is causing the rattles I came to conclusion it may be broken spot welds, looks like there is hundreds of them. So I am now thinking I would like a thick rubber mat, removable, like one for a pick up. Looking for "out of the box" ideas, something to keep the cost down. I had considered just re-welding the horizontal supports that are spot welded, pretty time consuming and the fuel tank would have to be dropped, and with my luck it would still be noisy after all the work, what have you guys done for this?