I would think that the length would be much more of an issue than the beam.

I've never seen it done, but I don't know why you couldn't mate up a lightweight boat trailer to a hitch meant for a bici.

I've seen people pulling canoes of at least 14 feet behind their motorcycles, and honestly it looked very unsafe.

But if it's only two miles - and you equip it with plenty of red flags as you would for an ordinary oversize load - it could work.