Again,... not fond of those "rachet-tooth" styles other than light general automotive use.
And the plan set is typical of commercially available ones that I find to be too shaky and wobbly, and jus not a strong style.
Rick described exactly those I find to be ideal for general use OR heavier work, and I'll likely build another set of 'em. Heavy square stock, full-length center welded at bottom plate with angle-iron supports on all four corners to the same broad square base. The support fits the center close, to minimize movement and wobble the entire length. And may consider interchangeable cradle-tops,... sometimes you want one for axles, sometimes for frames, rails or flats. With receiver stock,... 10-12ton! A bit heavier (with 1" pins),.. to 20+ton! Maybe with a welded inscription,... heirloom quality to last my grandsons lifetime too.