Buddy of mine has a 6x12 v-nose trailer. We put a street glide and my fatboy in there at the same time. bikes pretty much had plenty of room at the time. but my FB didn't have bags on it yet, so not for sure what it would be like now. there was plenty of room in the nose for luggages and such.
Of course you are talking a little more money, but if you want plenty of room, you might look at going with a 7x14. in the 6x12, handle bars will be tight against the wall.
but i would suggest staying with the v-nose for sure. adds space and less wind drag to pull as well.
Mike Hutchings Broken Bow, Ok.
2012 Street Glide
SE - Ventilator AC, 255 Cams, Race Tuner
V&H - Power Duals, Hi-Output Slip-Ons
2012 Fatboy Lo - Traded in