This started out as a simple quest for a used tonneau cover for the GMC. I needed to secure the contents of the bed from time to time, and did not want to spend much. I thought I would find dozens of choices for a common 8ft bed, but the vast majority are for crew cab and short bed applications. Some of them might have worked, because of the toolbox, but it would require actually fitting them to find out. I was almost ready to consider a mail order rollup version. After a few weeks of this, I saw an ad for a Leer Cap mixed in amongst the Craigslist Tonneau listings.
It was one of those "aha" moments. I had not been looking for Caps because I did not really want something difficult to take on or off, and they are usually expensive. I did want security and better gas mileage. A quick browse turned up several within 50 miles. The first and the closest was a Leer cap with a rise in it. It was in good shape, but was missing the key for the locks. It was also not the color of the truck. A few minutes of measuring, and I made a lowball offer. It was mine for $20 over the lowball number. A fantastic deal for less than a used tonneau, and it is still tall enough to fit a motorcycle !