I'd go with a 20' equipment trailer. I have a L3130 with loader, backhoe and a 18' trailer, 16' plus 2' dovetail. The length itself is ok but getting it balanced is another story. Without the backhoe I just drive most all the way forward and its ok. With the backhoe(1300#) I have to hang the bucket past the front rail about a foot.
Then there is the weight rating to consider. Mine is rated at 7000#. When buying that trailer I NEVER dreamed I would have a tractor let alone a backhoe. With the backhoe I'm a 200-300# over weight.
With a 20' 10000# or 12000# equipment trailer you'll have some extra room for other stuff and the rated capacity to carry it.