Hello again: I did use search and there is a fair amount on the bed extender. I am probably being dumb but what aside from the bed extender do I actually need (2010 ST). I found one (expensive!). It seems to have the 2 little bins at the bottom (or is that the top)? Do I need anything else? What's a locking pin? Do I need that/those? I don't want to spend much more than I am having to spend on the bed extender of course! Sorry new to a ST and a few years on from these old threads, some parts are not available... Many thanks from a Newbie!