Neat idea Tuggers - but there's always some smartarse with a "better" solution!!!!
Is it worth thinking of modifying your little slots so they can be permanently attached just inside the top of the bedbox front?
Just a thought, but it would hold up the base almost as high, and you could simply lift it and drop the leg in the slots without any firtling and fumbling for the detachable bits.
Nice one though. 9/10 for effort!