The marina is very secure, both in terms of physical security from people and from weather.

I can send you contact information, but you can also just contact the marina at the address given at https://www.igymarinas.com/marinas/rodney-bay-marina/
Any crime is down south, mainly at the Pitons and Soufriere. I much prefer St. Lucia over the BVI - and I spent over 15 years there before finally giving up.