Nicolas. Why not nail together a pair of planks and lay them over the rocks. Then you have a nice ramp to wheel your boat over. Put them under your boat when you are done, and nobody will notice..

Isn't the 18 a handful to solo? Have you tried to right it solo? If not, you should check the archives of "On the Wire" (available on http://www.thebeachcats.com) and look for Gary's SoloRight. I dont thing he sell them now, shipping was to expensive, but a SoloRight is what you need.