I'm sorry, this is a weird one. I need to carry home plywood or even drywall once in a while and I'm tired of asking my neighbor who has a truck. Nothing like being self sufficient. Meanwhile I have a (paid for) station wagon and a not inexpensive Yakima rack system for carrying bikes and kayaks. The thing certainly holds all that securely, so why not a couple of 4 x 8 sheets of plywood? I searched the web thinking someone somewhere must have sorted this out, but nothing. Seems a few clever adaptations would allow me to clamp down some wood and haul it on my own. Anyone here every made their own or know of some commercial adapters?
P.S. I know about wind and sheets like this when you try to carry things on a car without a rack (never a good idea), but it seems you could tilt the wood on the rack in some way to deal with aerodynamic forces. Also, the rack holds a 18 foot sea kayak quite sturdily, so if clamped down securely is this still a dumb idea to think about 4x8 sheets of wood?.