How do you ride them upside down?
I think I will stick to my fishing gear. Sounds easier.
To carry a bike (pedal cycle type!) I usually roll it in upright, tucking the front wheel in by the passenger side door and running the bike across diagonally. Then run a 1" ratchet strap across, wrapping it a few times around the seatpost on the way, and tighten it to pull the bike down and forwards. Usually you can fold up just the passenger side back seat for this. Anchor the ratchet strap either on the loops in the floor or in the metal loops which the rear seats lock into halfway up the sides. Do it right and the bike is completely wedged and immobile...
Don't like using bungees for this - even when pulled tight they still let the bike move as you corner, brake etc...
But to be honest for short trips with the bike in the back and if I'm feeling lazy I just bung it in with no straps at all. It bumps around a bit but not really been a problem. Obviously check that no handlebar ends etc. can press on glass anywhere... and definitely strap it down for longer trips.
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