Armdrag - Keep up the good work and postings! Very common to see those "vertical use only" used horizontally on the WW. Love the design, hate the execution. I had to do a similar reinforcement in the right rear, 8' of angle iron sandwich because they used the same stuff as the bottom of the wall, it looked like a snake. I will be opening up the bottom 2/3 of the wall sometime later this summer to fix similar problems to the side door (another 10 feet) and add support to the wheel wells. Really like getting a better idea of what's in there.