I use my truck a lot for towing, woodworking, and as a family hauler on long trips. so I needed a toolbox that worked with a tonneau cover without sacrificing a lot of bed space. I decided to pull the trigger on a Truxedo Tonneaumate toolbox with a Truxedo Deuce tonneau cover.
The toolbox sits on rails that are clamped to the inside of the bed of the truck. This allows the tool box to ride about 1/4 below the height of the bed. Because it is on rails, it also sits above the bed of the truck as well, which allows me to use the entire length of my bed to haul lumber. Even if my tailgate is up, there is enough clearance to fit a few sheets of plywood underneath. It has a decent amount of space in it. I can carry all of my tools without issue. There are no dividers or organizers inside of, but that wasn't a dealbreaker for me. The material is hard plastic, not metal, but it's pretty thick and rated to 200 lbs. Below are some pictures with the tonneau cover rolled up.
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The tonneau cover is designed to roll ups from the tailgate up to the front of the bed (as shown in the pics above). But it also has the added benefit of having a section in the FRONT of the bed that folds back enough to get access to the toolbox. It makes it really easy to get to the toolbox quickly without having to unroll the whole thing. The latching mechanism for this folding feature feels stout. It does take a significant amount of pressure/force to open the latch, but I imagine that will soften over time.
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These two items were designed to compliment each other. The rails that are used for the tonneau cover are the same ones that are used for the toolbox. So I didn't need to use the extra hardware that came with the toolbox itself. I assume that hardware would be used if there was another brand of tonneau cover that you wanted to use. I also wanted to mention that the toolbox itself could be mounted anywhere along the length of the bed. I just chose to mount it towards the front because that's where it would prove most useful to me, and thats where I could get access to it with the folding feature for this particular tonneau cover. The toolbox is held in place with 4 bolts on the rail system (not into the truck), so if you needed to take the toolbox out, it would be pretty easy to do so. The tonneau cover itself seems like its made of quality material, and it only sits about 1/2 above the height of the bed.
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I installed it today and so far I am happy with the purchase. All in all it took me about an hour to install both items. It's not super complicated, but it would probably go by quicker if there were 2 people installing it. I really like the functionality. I get the weather resistance of the tonneau cover should I need to take luggage with me on family trips, with access to my toolbox and bed space underneath should I need to haul lumber.
All that's left to see is if I installed it well enough to keep rain out. I will update everyone once this thing has been tested with some weather.