Guess it all depends on whether you want to use it to get onto the boat once it's in the water at the ramp or on a bank as well or just when it is on the trailer. You see a few Cruisecrafts with something like this down one side of the bowsprit - just folds up and is secured to the bow rail when not in use
http://www.ebay.com.au/itm/like/261149371285?chn=ps