Hi there,
I’m trying to figure out the same things. Dunno if you’ve already done this work, but I’d love to hear what you figured out.
Turns out you can order a Thule rack and a medium-sized Thule roof box through Ford for less than i found it anywhere else. I found it via
accessories.ford.com
I couldn’t find anyone else selling the medium box. It’s only 66” so I think I’ll be able to mount it far enough forward to allow room for my 14” fan to be installed. I’m paying someone to install the fan for me. Based on the curve of the roof, I think mounting it in the center might be best, but I’ll let you know what he does once it’s complete. George