Getting on in years, but still keeping up with the best, (I'm not biased of course )my largest refractor is this 1992 AP180EDT f/9 with Feathertouch focuser. The Anssen Alhena mount is also from 1992, and carries the telescope with ease. The mobile pier was fabricated by myself and a mate, the third wheel detaches simply and screw jacks then stabilize. Its a magnificent thing, and a real pleasure to use.