Have you tried the Hauling Board on the Yesterday's
Tractors web site? That's a good place to try finding someone who might be headed in your direction with an empty trailer.
Worth a shot before you try renting a trailer.
On the other hand, I bought a G/N flat trailer to haul my 4400 around on (a 14,000-lb GVW trailer with a flip down beaver tail) for about $4k -- so far haven't hauled the 4400 but I've hauled a lot of other things and made some $$$ doing so -- from heavy equipment to vegetables

G/N flat trailers are not that expensive and you'll be surprised how much work you can find to do with them.
Just a thought.
John