I have a TNT 8.5'x19.5'(including the V) V front enclosed trailer. I've transported 5 bikes with no problems in this rig along with all the gear, gas, tools, etc. for them. I would not want it one bit smaller for this many bikes, though. It's a double axle with elec brakes. It has two swinging doors on the back, which I personally prefer to a ramp door, and one side door towards the front.
Featherlite makes a great all aluminum trailer. The factory is about an hour south of me and it's cool to see the big NASCAR rigs sitting in their lot when I travel that direction. They get a premium price for them, though. They also make a steel frame, aluminum sided trailer. It's just like the units from Pace, Haulmark, TNT, etc. I would not pay any more for this trailer than any of the others as I feel it's exactly the same quality.