I put in the KSH 45 gallon fuel tank tool box combo.
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The tank itself was decent quality, but I did have to do some small mods ensuring its longevity. One problem was the rivets on the hinge lid, they were not set properly on each end of the hinge allowing them to work. A few openings of the lid would eventually cause them to loosen, so I drilled and added two flush, stainless flat-head screws with nuts on each end, problem solved. The install kit is overpriced for what you get in my opinion. It comes with two lengths of 5/16 and 3/8 hose, several clamps, a fill pipe hose inlet, a Chinese made electric pump and some wiring with a toggle switch. The pump's electric connections are not very good, They are a slip on type and easy for them to fall off. The US made version of the same pump has its electric connections made with nuts and washers. The filler pipe connection was not the right size to fit the filler hose on my F350 and there was not much room to clamp on the filler hose and no barbs, I expected it to leak.
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I ended up modding my filler neck as shown, the fuel is pumped in the main hose and the breather is for the aux tank is added to the filler neck breather pipe.
Overall, not a bad tank, decent room in the tool box area, however no instructions that match any of the equipment are included, so as long as you're confident plumbing fuel lines through the bed, running electrical through to the cab, it is not a tough install. I would have preferred not to have to make so many adjustments to make the locks and latches work properly and beef up the hinges, for the price it should work right out of the box.
Moderator edit to re-sie picture to forum limit of 640px maximum width.