The safe course is to not use the logo and to just say something like "We offer for rent a variety of boats, including high quality BOSTON WHALER boats." Unlikely Brunswick is going to object to being called high quality and it is nominative use [commonly called "trademark fair use"] anyway if they were to question the use. Just make sure you do, in fact, have what you say you have and offer what you say you offer. You don't need the logo, customers know what a BOSTON WHALER is without seeing the logo.