After much deliberation I decided to follow the factory manual (which recommended a minimum of 4inches of concrete for the anchor install) and drilled into my preexisting concrete to install the lift. While doing so, I measured each hole to ensure correct depth. All the holes were over 4inches in depth. I installed the anchors and torqued them to spec. I had to loosen and re-tighten multiple times while I was shimming the columns to make them level. The lift has been up for a few months now, the largest vehicle I’ve had on it is a newer 4 door 4wd Toyota Tundra. I followed the manual and checked the anchor torque every so often (which reminds me I probably should check it this weekend). It’s definitely a nice thing to have, as soon after I installed it I had to install a clutch in one of my cars, and a transmission in two other cars. As well as another one of my cars needing a clutch soon.
