I've DIYed an upholstered, king-sized headboard (5'x6'10"), but after trying to bolt it to the bed frame, I've realized that the bed frame is much too light to prevent the headboard from toppling over. What's worse is that there's an electric baseboard heater running the length of the wall (where the head of the bed is), and wall mounts are not an option (apartment living, yay). While there's plenty of room at the foot of the bed, I'd rather not have the bed in the middle of the room.
I'm guessing the best thing to do is to add some counter-weights to ensure that the headboard can stand on its own without being bound to anything. Unfortunately, I don't know what the ideal counter-weights are, nor do I want to build something that would be difficult to transport in the event we have to move. What would be the best course of action?