Quoted from PinballHelp:You guys with the carts, you don't put some cross members between the cart and the game? I will sometimes use 2x4s or 1x4s so the weight of the game is balanced on the side panels and not the panel underneath.. that kinda scares me, especially on older games.
I've never never found a need to do this. When under the center of gravity I've never had a game tilt, even when hitting a crease in the sidewalk and coming to a quick halt. As a safety measure I always move with legs on, but it may help to keep some friction on the top, like gluing down the rubber pad it comes with or attaching carpet.