An interesting note: while some sites recommend a 10%-15% tongue weight, the receiver mounted on the truck usually has a MAX tongue weight that is 10% of its MAX trailer weight. That is, it appears at maximum loads the receiver is designed for a MAXIMUM tongue eight of 10%. There are a few receivers that have higher than 10% max tongue/trailer weight ratios, but they are close to 10%. For example, a 1700# max tongue weight with a 15k max trailer weight.