I purchased this unit specifically as we tow a van and wanted the large vehicle assist feature. Unfortunately the unit will not allow a towed height setting greater than 2.7m and our van is 3.4m. Also the SUV setting has a height limit of 1.99m and our vehicle is 2.3m It was easy to set up, but never made it in to the vehicle due to the limited settings. Navman said a software update would fix the issue, but after two updates it had the same height limits. Navman offered a full refund and the unit was returned.