I see people concerned about reliability and perhaps Tough would be the best choice for heavy duty applications when it comes to contractor needs. But I use it for RC helicopters, related parts and accessories and for that it works great. I don't think there are too many heavy tools. I use all the different components, but a box is great for transporting and then easy to use in the field without arranging the components. And I found the Stanley Tools and Consumer Storage STST14028 Tier Organizer and Sortmaster Junior to fit perfectly in DEWALT's DWST17820 TSTAK Mobile Storage Box on Wheels. You can stack 2 or 4 smaller organizers and have more room at the top for a plywood lift with loading foam in my case but whatever. And keep everything super organized but also easily accessible.
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