The unit is easy to install and the instructions are very clear as to which bolts go with which washers. The device physically extends far enough to provide a large positive rim offset so that the tire never touches or rubs against the truck tongue. I'm only rating it a four instead of five due to two design flaws. First, you can't install it with optional accessories that have a different tongue (such as a Demco tool box). If you have a tongue jack, there is not enough space to install theseβ¦