Please note all images are for illustrative purposes. Knott 3500KG KFG35 trailer tow hitch/coupling Ifor williams P00340 Free Post. Knott Avonride fit all their coupings with a breakaway cable. Designed for use with auto reverse brakes. Fitted with an Avonride Locking coupling head (supplied with 2 keys). Hydraulically damped energy store therefore making operation of …