Advice on positioning boat on camper roof please!

Thanks all. I just took an additional (and somewhat important) measurement which confirms that I do need to hang both ends over the camper or they'll hit. :)

I'll definitely tie it down front and rear, somehow!

I would prefer better spacing on the factory "boat rack". I guess they had a different kind of boat in mind. I'm nervous about drilling into the roof to install another bar but I suppose I could get some guidance from the manufacturer. They're pretty responsive.