Hopefully some of you can help me out with ideas for transporting our bikes. I have a full-size truck with a 6 foot bed. Up until now I have transported only one bike at a time. I position the bike upside down on the seat and handlegrips. I pass a ratchet strap through the front wheel and dog it down. That's great for ONE bike, but what about two? I'm thinking upright, one facing forward, one back, but I don't want them falling over or banging into each other. Has anyone built a secure stand in a truck bed for transporting two bikes? Pictures? Thanks!