Thanks. I went back and re-read it. I admit I had skipped that part, since I was mostly here for the oak debate these days. ;)
I think that Rich drawing RC lifting the crate + MitD combo does definitely set some kind of upper limit for MitD's weight, but I also think that all the possible variations in crate weight due to the type of wood used are well within the margin of error we should apply to Rich's tolerance for "letting" RC lift both MitD and that crate.
Let's say we take the lightest possible crate made out of a decently strong wood, consider RC was BullStrengthed (I'll refer to GW's post with the little table), and see what kind of weight limit that would set on MitD... might be interesting to look into it (shouldn't be too long), but not tonight, though.