I'm surprised there isn't more discussion on this topic.
I'm looking for a toolbox + tonneau cover also. TCUSA seems to be the only manufacturer offering a legit product, but it costs $2,550 without the options (lights, actuators, Line-X, Yakima track, etc) or installation. Holy ****. I don't want my secure storage solution to become a primary target for theft!
Who has pieced together their own toolbox + tonneau cover? I figure a great toolbox plus a cheaper vinyl tonneau would cost less than $1,200, but I have no idea how water-tight it would be.
Truxedo has discontinued the Truxedo Plus, which seemed like a decent option to me. Several manufacturers offer "under-cover" boxes, but most appear cheap, flimsy, or insecure.