I had the inside of my Jimmy done with Rhino Liner about three years ago. It is holding up good. My only complaint was the first coat was too thin in the cab floor area. They redid that and the texture ended up being a little different. As far as the actual product, I am very happy. It is so much easer to clean than carpet, it is even better than the rubber mat I had in my 78.
When I had it done I removed everything inside. It is coated from the firewall to the tailgate. If you leave the top off for any length of time it will make your life much easier. The one thing I would change if I were to do it over is to add drain holes & plugs before I had it sprayed.
There are pics of mine on the "Custom Storage" page of my site.
Jim '80 GMC
Freedom First!
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