I hauled my BX with FEL on a 6.5'x12' single axle trailer, and it worked fine. I think I remember that the tractor, MMM, and FEL weighed a little over a ton. Not sure what the BH weighs, but I am guessing you would 2500lbs. minimum. I think you should consider a tandem axle trailer, and once you get a tandem, I would recommend a 16-18' model.
Will