Colin says: How to go boating - Lesson 9: Onlookers are your friends. For the same reason that you should never put your trailer fully into the water you should never ever take your vehicle right down to the trailer. There are often people just loafing around without apparent reason at launch and recovery sites - and while they might well be to shy to offer - most of them would just love to help manhandle your boat and trailer up the ramp to your vehicle.
(To save this picture as Windows Wallpaper - right click it -
then select "Set as Background") (or click the above image to see the full sized version)