Are you talking about a charter
boat you are buying
and fitting out, or one you are renting
for a vacation
? If the later, you will be liable for any damage, or perceived damage, from installing your own gear
. A boom brake can break the boom if not designed for it. And lots of charter companies will look for any perceived damage to keep a hold of that big deposit. I wouldn't give them the opportunity, or worry about the need. You will not be liable if damage occurs during a crash jibe on the standard boat. You will be liable if something is damaged while using your personal equipment
, no matter the cause.