Cut it up into five 4' pieces and make 5 trips.
Hire two undocumenteds to walk it home for you.
Put each end into the trunks of two of your cars and drive home slowly (with the following car in reverse and your best driver in it).
Buy some cheap clamp on wheels. Put them on one end and the other in your trunk or tied with baler twine to your rear window wiper.
Build a box on your existing trailer so that the overhang goes above the roof of you car. Careful of not breaking the front axle.
Flatten it out and fold it up into a California Approved Green box. Seal the ends and reinflate it with your air compressor, a fire extinguisher, or some starting fluid and a match.
Buy a 24' pipe and fold it in half to fit on your 12' trailer. Stomp on it to reshape it and cut off the unused part.
If its (lightweight) plastic pipe, rent two drones to fly it home.
A couple of Birthday balloons may be all it takes, too.
Happy trails !!