Mount the U-bolt as follows: The protective rubbers are already fixed on the U-bolt. Place the lock washers at an angle of 90° to each other on the outside of the
interior distance tube as shown on the detailed view. Insert the U-bolt and put the carrier bolts M6 x 100 at first through the U-bolt, then through the lock washer
and finally through the distance tube. Secure the U-bolt with the 6mm washers and with the M6 plastic knurled nuts. If necessary, the U-bolt can be moved
slightly after removal of bicycles in order to open the bottle case of your caravan. See picture below.