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Get the stuff from US Plastics. I did , its thicker and you will need it anyway. I have the trekker also and used a set of ski's and pvc pipe and attached 3 inch pcs to tub add 10inch pcs of 1/2 in galv. pipe to skis, then all you have to do is lift tub slide pipe into pvc and away you go.
When you placed your order what size did you end up getting? Is the first measurement the width of the bar or the thickness?