15. U-bolts hold the RV base to the RV post. Before the U-bolts are tightened, the RV base is placed square in the truck bed, and a draw-down bolt is installed through the RV base and into the RV post. The draw-down bolt creates upward pressure on the RV post so the latch pin cannot be disengaged. In other words, the Companion hitch must be unbolted from the RV post each time you want to remove it from the truck. The draw-down bolt and then the U-bolts are torqued to specs in that order.