Likewise Thule:
http://www.thuleracks.com/carrier_water1.asp
I don't have the above on my rack system. I just 'carefully' heave whatever boat(s) I'm hauling up on the rack in a way that doesn't scratch the vehicle. For canoe I carry her like I'm portaging (from yoke), saddle up beside/parallel with the car then lift it high off shoulders until one side of her gunnels is propped up on the other side of the first set of canoe supports (I use a Thule system). Then just inch it sideways til she's up and clear.
For Kayak I load it generally from the rear of the vehicle, then just hop/push it forward til she's saddled in her cradle properly (again, Thule supports).
Unless it's real windy or a long (4hr+) drive, I only strap either boat down crossways with 2 straps: Thule (blue) or Yakima (black) strapping. If it's windy/long drive I tie her down with a length of climbing nylon rope to the brush bars or the winch/tow-hook placements at the front underside of the vehicle.