Multiple Waterfed Pole Storage

Can you mount them from the ceiling, so the brushes hang down, unobstructed?

The roof of the trailer looks kind of weak. I had some normal poles hanging from a hook that was attached to one of the cross members. Ripped out after a few pot holes. I don’t think it would hold up to the weight of my WFP unless I put in some supports. I can’t complain though the trailer only cost me $950.00. I would like to attach some pvc in the upper corners.