I've got a '06 DC with a Weatherguard tool box.
Undercover makes a "Box Buddy" short tonneau for use with the tool box but not for toyotas. I dont see anyone else that makes something similar, am I blind? Sure would be nice to have one....
I had a tonneau & tool box on one of my trucks. I am trying to remember what brand it was. The tonneau was diamond plate too, and looked awesome! It was a well known brand too. It was Dee Zee.....I am sorry.
A roll-up tonneau came w/ my truck, but I needed a box for work. I have started to modify it to work with my box. I have already cut the side rails to length, but I think I'm gonna let an upholstery shop shorten the fabric. Might be just as easy for you to buy one and modify it yourself.