So I've had this used 2014 Model S for about 2 mos now and I'm itching to mod it. First up, I want to add a roof rack. Been checking out the Tesla site and apparently, the car needs some tweaks to handle the rack. Tesla says they don't offer this mod, which is a bummer! Any of you know what tweaks it needs and why Tesla's dodging this? Curious about it. Starting to think aftermarket options might be the way to go instead.