By yourself, it will be a little tough and if the ramp has an incline? Here's an solution we came up with to get 5-8 boats across the sand dunes after a long day of sailing on Lake Erie. 24v power-trax using a lawn mower rear end and electric scooter parts. You don't have to use both crossbars to support the boat one will work. I haven't used it for the for this boat yet (our beach is under water.) but 16's and 18's are no problem.


Jump 40 sec into this video in my driveway.
[youtube]https://www.youtube.com/watch?v=PGVuAPKpp2E&t=5s[/youtube]
Don't know if this will help you but it's an idea.