I'm now curious as to how sturdy they are. How much can I pile
on top (e.g. luggage) before there's a problem.

We've loaded it up pretty good without difficulty, but we have soft-sided
luggage.

Actually, for OSH and Sun N Fun, we remove the box completely. We simply
don't have room for all the "survival gear" when we are carrying a weeks
worth of clothing and camping gear for four people.

Those are the two times per year I wish I had a Cherokee Six! :-)
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"