Yup, those caps would work well. I might get some to try out. But it really isn't a problem in my set up. I thought about capping the ends but since I have not had any (not even close calls) in about 4 years (since I built it) I plan to leave it. I also don't want to end up catching the clamps on the cap rim as I bring them out. My spacing between levels is quite close. There is not much "lifting" room.
But the caps certainly are a good item for the right situation
I will try to take some pics showing leg room later.
Oh, I think the rod is 3/8" so rebar caps should fit well.
Seth