A trailer works great! This one was built by Trailers Unlimited in Anaheim, CA
4'-0" x 6'-0" with a 3500 lb. axle with 15" wheels. Tows straight as an arrow at 100 MPH.
Mileage did go from 27 @ 85 MPH to 22 pulling the trailer, all aero drag! You don't even know it's back there.