The Big Vee drive on bow stopper has a 375mm wide Vee shaped catch area, so when you drive on, even if you are off centre then the Vee shape will catch your boat and guide you back into the centre.
All professional fisherman “drive on”. They understand the risks and difficulties of attempting to manually move a boat onto a trailer against the wind and tide. They also have no interest in the physical effort winching a boat up a trailer involves. Plus driving on is a huge time saver.
The Big Vee system replaces the narrow bow stops that have been in existence for the last 80 years. Those old bow stoppers were designed to provide a soft surface for your boat to sit against once your boat is winched forward into place. Unlike Big Vee most of them offer no or very little guiding ability.