I tried out my portable bed stirrups by myself for the first time this morning.
As you may know, the stirrups were bought from eBay for $100.
I attached them to boards and slid them between my box springs and mattress.
The two 1X6X4' boards aren't connected at the top yet, but the whole thing is stabll and stays in place just fine the way it is.
All fasteners are bolts and wingnuts, but hitch pins can replace some of them to help speed up assembly and dis-assembly.