I'm tellin you guys, this nonsense of tying "X" (cross) is just that. If one comes loose, the car can walz sideways and then the three remaining are LOOSE. If you tie it straight forward and straight back, 1 can break or come slack and the other two will hold against each other, and the remaining 3'rd will still hold against the opposite end. If it is too thing, figure a way to beef it. Ad structure underneath or whatever it takes