Couple of pics to show what I'm talking about...

 

I don't think the rear headrest posts are removable unless you do a major surgery to the seats. They are integrated into the seat fold-down system.

 

Roof rack...

 

AJR, have you tried suspending the SUP closer to the ceiling? There are two handles in the front and two in the back. What if you install something like two "Car clothes Bars": http://www.amazon.com/High-Road-Expandable-Car-Clothes/dp/B001NI7KE2

Or even two bungee cords. The SUP might snugly fit between the bungee cord and the ceiling.

Caution: Your rearview mirror will be blocked.

 

I did. I ended up running a cambuckle strap between the front grab bars but the board's a few inches too long to suspend from the rear grabs. I put the two car seats back side by side so i can flip the rear p-side headrest forward. Thx!

 

The clothes bar is a good idea though... I may give it a try next...

 

The rear headrests can be folded flat only you have to pretend to drop the back seats and they automatically fold flat, then lock the seat back.

 

Yeah - I know how to drop the headrest to the flat position (you just pull the loop that's next to it) but the problem is that the car seats are taller than the seat back so it physically can't drop down...