We carry one like this...
step ladder [
bedbathandbeyond.com] -- relatively inexpensive, pretty light and generally works when there isn't a ladder nearby to fuel up. Beats climbing on the strut and balancing on barrels.

Any chance of getting a pic next to the plane for comparison? This looks about the same size as the smaller step ladder we have at the fuel farm at HNB, which is just about perfect despite my low stature
