I have a Lightfoot Cycle Subaru powered Recumbent bicycle. It is great and would do what you are asking with ease. Lightfoot Cycles also makes either a gas or electric pusher trailer. The gas is the Subaru 1.6 HP engine. I am not sure however I believe the electric is a Eco-Speed system. Here is their link.

http://lightfootcycles.com/products-...usher-trailer/