From the different reviews and pictures, there are at least two versions of this product. One version has more complete instructions and holes along the center bars to install crossbars to hold weights. The crossbars in that version have holes to mount to the center bars. In the version that I got, the instructions are one page and there are no holes in the center bars and no way to mount the crossbars. A simple solution (which is better than either crossbar IMO), is to build a platform out of 2x stock. Three pieces of 2 x 10 fit perfectly. Add 2x ripped down to 1" to give a lip on the platform and underneath to minimize wobble. Haven't run it around the yard yet, but with some weight on it, I think it will be fine without bolting to the frame. Including photos of the end of the crossbar that doesn't attach.
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