Built mine 16"s wide for my wider rear tires and they feel really safe aswell, these stands are like a self smack in the head going why didnt i think of that not big on copying anything but these are way to nice and make the job way easier and safer to work on!
Used screws in mine long enough to go through both boards and one in each corner!
Another good use if you noticed they "DSE' put them on there sides and put jack stands on them to support bodies etc!
Its not by accident that DSE is where there at with the quality in there cars its little things like even these stands that is the attention too detail and the pride that goes into eveything they build. You'll find all the great builders be it shops or individuals if they are a very detail oriented person it shows in there cars aswell!