I only use 2 poles, slx18 & slx30, the 18 is on the outside because it gets used the most, 30 only gets used once or twice aweek.
I did have the poles, on hooks, either side of the van,
But ive now taken my double ladders off the vans roof rack and now carry a little giant tele ladder inside, on the other side of the van,so wanted the poles together