I use a snowmobile trailer now, can easily haul three bikes on it, with all the gear inbetween. A couple things i like about a trailer is- a good dressing platform, easier to load the bikes, three riders can alternate vehicles each time. I am really poor right now, so i actually pull my trailer with a 1987 delta 98 olds. Plenty of power, and i can still get 22 mpg going 70, and haul 3 people, with gear locked inside the trunk or the back. Everybody looks at me wierd when there is 10k in bikes on a 1500 dollar car/trailer rig. But ive got my priorities straight.
Chad