Hell fire Laurence, I hope our destination won't present such extreme conditions as those, but I take your point!
In short....we would be tied to a jetty,
The water levels do rise in winter, so we would have to adjust the ropes AND possibly anchor off the jetty if the levels rise above the jetty posts....still having palpitations re exhaust and trad stern tho!
Sadly there are at least 2 " quality GRPs" for sale where we are going, and they've been so for at least 2 years, so the idea of buying and selling one here isn't really viable :-(