I much prefer carrying my $2500 (and counting) mountain bike and my $3000 road bike inside the vehicle just to keep the wind-driven rain off the bearings and keep the bike clean. Second best is my behind the car bike rack. Now I'm in a situation where I need to carry my ATB on the roof so I can fill the truck with cargo and tow a trailer at the same time.
Anybody have any negative bearing (or other) experience with a bike on the roof? I'm planning to use a fork mount (Yakima Viper as I have disk's) and one of those covers that covers the front part of the fork, the bars, shifters, levers and extends across the top-tube and covers the saddle. I drive around 70.
The scary part is the possibility of forgetting the bike is up there and pulling into the garage.