I don't know everything there is to know about this either, but I can tell you what my MXP100D does. I drove my car in LOW for the first several days I got the car. Kept it in low everywhere, and it was perfectly fine, so that's where I keep it normally, and I also have the Automatic Height Adjustment set to ALWAYS adjust for speed. The requirement for towing is to have the car in STANDARD, so I always put the car in STANDARD just before hooking up the boat. When I back down the boat ramp, I put it in VERY HIGH to keep the car out of the water. Early on I would forget to switch it back from VERY HIGH to a lower setting. The car automatically moves from VERY HIGH back to standard at some speed on the highway - not sure what speed that is. All I know is I would remember when I got home from the river, and when I would check it, I would see that it switched from VERY HIGH to STANDARD, which is where you want it for towing. If you're not towing (in TOW mode), I believe I remember it switching from STANDARD to LOW at a certain speed as well (maybe 80mph?). The car also learns. Now sometimes when I back my car up to front of the garage where my boat is, the car will automatically rise from LOW to STANDARD in anticipation of having to tow the boat. I also put my car in VERY LOW from time to time on the interstate, and I've noticed that when I slow down and get off the interstate, it will change back to LOW, which is where I tend to keep it. I don't think VERY LOW causes the tires to bump the suspension or anything else. That has never happened to me. If someone has different experiences, would appreciate hearing about it. Thanks!