Aw dude, that sucks. I load two bikes all the time in truck. I tied two bikes together once and decided I didn't like it. We didn't have that happen though. The I-bolt into the middle of the truck bed is probably the easiest way. We don't have one so we put both head it and go through the rims. I generally put one bike on the rearstand while tying the other down. Then I tie the other down. You just gotta make sure that the rims are lined up so the spokes aren't getting in the way.
