I believe that the coated is a thicker base nylon. The impregnated is normally 1.1 oz/sq yd nylon that has been impregnated with silicon. This normally brings the weight up to 1.3 oz/sq yd. It looks like the coated is 70D nylon as the base which is 2.8oz/sq yd. I'm not sure how much the weight increases for the coating.
That's 70Dx100D, which is a heavier fabric than 70D. If you look at 1.9oz/yd^2 fabric on the same page, it is referred to as 70D.
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Transportation for Hiram Farm
Two Wheels Good, Four Wheels Bad
Thanks, and Apis, have you used the 2nds before. Just wondering how cosmetically blemished it tends to be,