Sorry, no pix, but a few years ago I saw something I thought was really slick. And it was on a general-purpose rack, not a ladder rack, per se...
You know how most ladder racks use four flat brackets that stick out from between the truck bed and the camper shell to hold the uprights? Well, the one I saw used a piece of tread plate (diamond plate, five-bar, etc.) that ran all along the side, from front upright to rear upright, and extended out about three inches from the side of the truck.
That way the guy had a platform he could stand on while loading/unloading the rack.
Seemed like a good idea to me.