Yep, that's the way to reply.
It is a stones throw from the ramp at Victoria Point, like a few hundred metres, Have a look on Google Maps. It's actually called Coochiemudlo Island. Pretty small, but a 30 minute battery would not be enough. Definitely look to up the battery amp hours to give yourself a few hours of moving and fishing. If cost isn't an issue, look at getting a lithium battery.
Reversing trailers is one of my least favoured tasks, but you would get better the more practice you have. Viccy Point ramp on the Coochie side is a long reverse, so I wouldn't practice there.