ACME Tow Dolly here too--and still am using it. Dippytwo's point about the ACME is that, with surge brakes, when you attempt to back up you'll engage the surge brakes making backing up even more difficult (they do give you a way to lock out the surge brakes but that is more for when you're pushing the dolly around empty).
Note that you really can't back up with any toad towing system aside from a full on trailer.
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