Okay, I've piled firewood in the bed until I couldn't get another piece in it. This is about 3' over the side walls. I've piled dirt into the bed until not a shovel full more would lift it. In neither of these circumstances have there been any hint of a strength problem. As in a pickup truck, if you pile enough round logs in it with the tailgate down, the bed sides would undoubtedly flex outward I'm sure. However, if you have the tailgate closed, I've proven that you can pile as much firewood in the bed as you want; I've done it. /forums/images/graemlins/grin.gif
I do have a spray in liner with a Kubota plastic liner over it protecting the bed. It works well, as I've loaded and hauled several loads of rip rap out to the banks of my lake without any leaving any mark in the bed. With dirt, apparently I had under-estimated the weight I'd put in the bed of the RTV initially. If you use a FEL and pile heavy, compacted wet clay soil in the bed until it runs over every side, you get closer to 2000 to 2500 pounds of a load in the bed. Obviously this is over the recommended limit and the dump will not raise the bed, but the RTV has no problems hauling this load up any hill and suffers no adverse driving characteristics. As a matter of fact, it actually drives just fine with this much weight in it. I'd like to see someone put 2500 pounds in the bed of a Ranger and take it for a spin through the woods. I believe there would be issues. /forums/images/graemlins/wink.gif