90% of the time I am only hauling my own bike to meet other riders. I already have a 2-bike platform rack, and its heavy as f*ck. Pushing a 50lb MTB up to a roof rack sucks, especially after a hard ride when your arms are jello. The risk of damaging my car wasn't worth it to me, so I ended up with what I feel is the simplest/lightest/cheapest solution
Yakima Literider 2 (the 2 bike version).
I can carry the rack around in one hand as it only weighs 20lbs
I can take it off and throw it in my trunk easily.
I adapted the mounts to accommodate a single bike. The single mount on the left in the picture sits under the top tube. The two on the right sit under the seat stay linkage. They are held in place by a set screw, so all I needed to do was remove the screws, place the bike on the rack, position the brackets, mark where the new holes need to drilled, and done!
It takes 30 seconds to put the hitch on, and another 30 seconds to put the bike on and slip three ratcheted hooks. Bike is solid, and it works really well when cleaning the bike or doing bike maintenance as the wheel spin freely. I haven't used my bike stand since.