It's also going to be capable of landing on land like some of the old Catalina variants.
Also some smaller transports like this can have floats, even though smaller, as i mentioned they are usually turboprops anyway.
en.wikipedia.org
For Coasties though, yeah, this has potential to be a sales hit with how much of their work it can do, and cheaper than a helicopter would do it at that.
With a fraction of the capacity though, it may take 1-2 cars, at a price equal to a considerable fraction of their value, so probably not worth it for providing regular service.