1 2 3 in the bed of the truck, 4 on the deck for long hauls or as many as you can stuff in the 36' gooseneck!
3 in the truck is easy and they dont even rub as long as the center one is set back slightly. works fine even in 6.5' box trucks. 4 on the sled deck is tight but works for longer hauls where the long maze of loading isn't as big of a deal.
Don't even bother with a ramp if you got 3 guys/bikes, usually can find a snow bank, and lifting them really isn't a big deal either. Then no ramp banging around against the bikes either.