I have an old Techni-Tool hard-shell rolling case. Extremely sturdy. Key and combo locks. I took out the tool pallets and filled 'er up. I set my tool box on top of it, strap it to the telescoping handle with a bungee cord, and away we go. If I need my tools, then they are separate from the rest and ready to take on site or throw in the back of the car. I can also put something else on top of the tool box if need be, which usually means I can get everything in one trip. I found a few sites that sell similar types of cases. Lots of great options...
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