On excellent suggestions from the group, I replaced the straps with chain. I used De-Sta-Co clamps to secure. It's quick and doesn't allow any movement of the bottles once adjusted. I also added a couple posts to store the bottle caps.
A couple photos of the OA cart I just finished (other than paint).
>It's too heavy but rolls well. About half the weight is the wheels.
>They were cheap, but are cast iron and solid rubber. There are a
>couple of half inch steel pads welded under the front edge of the
>bottom plate. This keeps the cart resting on the tires and the pads,
>which prevents rocking. It seems pretty stable.
>
>I found a small toolbox at Ace and bolted it on.
>
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>Pete Keillor