This is nuts, and a fantastic achievement, both. I have a state of the art push longboard (Dregs Uptown, probably the lowest deck you can buy except for a landYacht, 72mm wheels, very clean Red bearings) and I've injured my achilles a few times on 8-10 mile skate outings.
http://www.silverfishlongboarding.com/forum/general-longboar...
also, i did the drive from Sydney to Brisbane with a couple surfboards, highly recommended. Next time i'll do S to W (in a campervan)