We like using the 1" square tubing available from 80/20, as the rounded corners make them a sweet fit with the kit channel. The kit channel can be cut into sections, mounted to the bumper backing, then drill mounting holes through the square tube at final assembly. A ball lock pin can hold everything securely in place. Pictured is a way we did it last year. We've had to modify it a bit this year due to size constraints, but you'll get the idea. If you'd like more detail on this year's version, PM me.
