Just brainstorming on possibility of a Independent 12VDC power socket inside trailer. To charge whatever while en route. Maybe run electric cooler or something. Solar on top could be feasible, depending on weather proofing & security. Figure something 6-10A reasonable & along with most vehicles power sockets, that am aware of preferably power from bike & detachable with trailer. Believe would be better to not tap into oem trailer wires.