8' (or even 10', depending on your model) studs can probably fit inside the vehicle if you fold down the rear seats and use a towel to protect your dash. If you have a sunroof, it's even possible to transport a few 12' boards by sliding them up through the sunroof and out over the hood/bonnet (again, with a towel to protect the roof). It looks ridiculous, requires taking slower backroads and is probably best done when there is little/no traffic but it is doable.