Legally it may not be correct to bypass a trailer with brakes, but if you keep the weight of the loaded trailer weight under your state laws for needing brakes, you will be acting in the spirit of the law instead of the letter.
I ran my e-track vertically (5' strips) on the walls instead of horizontally. In my 20' trailer, I have four vertical runs on each long wall. One side of my track is screwed through wallboard into the vertical sidewall ribs and the other side is only in the wallboard. Self tapping screws and a cordless screwdriver make fast work of this install.