The guy who wrote that is a flashaholic like me. But he isn't infected quite as badly. I, on the other hand, have a full blown infection, as evidenced by my 4000 lumen modified maglite, 2200 lumen Fenix TK70, high end 1000 lumen Zebralight headlamp, etc etc.
What he left out on that page (and what I have) is the
solar panel to recharge the trailer
battery, which in turn will run the flashlight-battery chargers.