I used to work with steel &#;I&#; beams, probably a little bigger than you are referring to. However, we never used curtain siders for delivery. In fact, whenever you see trucks on the motorway steelwork is always on normal open trailers. You are the customer!
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I guess the manufacturer of the beams have the same issue loading, so perhaps some clever thinking on the spacers used between the beams is needed to negate a person being on the bed. Ie temp fix of wooden blocks to the steelwork so it is lifted in with the load. Strapping down can then be done from the side.
But to answer, I think more detail of the load is required.
Being on the bed of the vehicle when it is being loaded and offloaded is not good. Bed of vehicle is too low for fall protection, so you would need fall restraint.
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I think for anyone to help you, you will need to provide a lot more detail of the load, ie is it in long lengths (full length of trailer) or multiple short lengths end to end and on top of one another. Either way I think my first suggestion at looking at ways to secure the spacers at ground level is the way forward and possibly work with supplier.
Did I mention being on the bed when loading is not good.
You can try The BCSA web site, they used to provide info on loading fall protection options
Chris
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