The bulb came on:
Ok, what I'll do is make the platform with the e-tracks dual purpose. Then I can run them standing up when I go on a trip and have a little more room. And for daily driving I'll lay them down. Means I need to go buy one more e-track...
Tomorrow on my way to work I'll but another one, and cut both in half, giving me four e-track segments.
In either configuration, the extra two tracks will give me a way to secure my jerries.
I still need to get two e-track clip in ratcheting tie downs, cable, and a lock or two.