I'm intrested in the Fast Trax style. I see on the 1st Gen an issue about sealing at the windshield, but what about the the Blazers with half-tops ????? I'd like something that bolts up like the factory top, but is a soft top, with the ability to open up like the standard soft tops, but without the snaps. With zip out windows. Isn't that how the one from Off Chamber 4x4 works ????? I've only seen the add on the Off Chamber 4x4 link, I've never seen one in real life.