Don't you find that double stand to be off balance when one bass is removed?
I have that one. Never had it fall over, but yeah, it looks/feels just a little bit tippy when only one bass is in it, and it's worse for Dingwalls because you have to put the neck gripper part up pretty high to accommodate the length. I had a real windy outdoor gig in September and it was a little nerve-wracking watching my Super-J waving in the breeze, held by only its headstock, while I played the other bass! If I could do it over again, I'd just get two of the single Hercules stands, those are really stable and you can adjust the height so nothing presses on your cable jacks.
That's a real nightmare!