This is my second Rover in 7 years and I'm still having issues with the seat slipping. Terratrike was kind enough to send me an additional seat clamp with the suggestion to install it directly behind the original clamp. Done....I also slipped pieces of an old inner tube on the plastic slide pieces of the new clamp to ensure better gripping. I also wrapped a piece of an old inner tube around the frontside of the seat clamp with zip ties to prevent forward movement. I took it out for a 20 mile ride and had 0 movement of the seat. Terratrike really needs to redesign the Rovers seat clamp. We (the customers) should not have to come up with our own fixes for this seat clamp. We should be able to set the seat and forget about it. Attached is a picture of my seating set-up that provides 0 slip.