4Runaway

Gotta question about loading up the roof rack on my 2nd gen 4runner. It's a stock rack and the specs on the sticker indicate something like only a hundred pounds or so. The official specs doesn't seem like much.

Anyway, I was wondering how much weight people have placed up there on their stock roof rack (or modified rack) in a real world situation without having the entire roof caving in (if that's possible)? I'm thinking about getting one of those cargo containers, too, and loading that up for a cross country drive.