I really like the idea of the step attaching directly to the hinge. Ideally they would bolt horizontally and match up to the dimensions of the hinge itself instead of vertically as they show in your pictures. I realize that would be a major redesign of the step though. But again, a great idea. Would really help with setting up the RTT.
Thanks for the input.
I could design custom folding steps for this application, but I'm trying to make these very affordable. I picked up these steps retail for $10.99 each, and the necessary adapter plate and nut plate to mount a step to a hinge would be very simple laser-cut pieces of steel. With the parts list being just the step, two inexpensive laser-cut pieces of steel and a few bolts and nuts, these could be very affordable. The adapter plate design will make the step mounted to the hinge look better that it does in the photo I posted, all I did for that photo was pose the step on the hinge.
When I get the adapter plate made and installed, you can let me know how you think they look and if you think adding to the cost by doing a custom step would be worthwhile.
Another reason I chose these steps is because they're large enough to be very easy to climb on. The steps on the market for the factory hinges that I'm aware of have a small bent loop of steel as a step which has a much smaller "footprint" than these. If you don't have sturdy soles on your shoes, those can be a bit uncomfortable to stand on.
BTW these steps are available in chrome, stainless and zinc-plated in addition to the black ones I bought.