One thing to note, while I like my Eberlestock packs (they're tough, and made for abuse), they tend to be one of the heavier packs vs capacity. For someone planning on hauling heavier loads, lighter helps.
Also, one thing to consider that's totally terrain dependent: I saw a really cool carbon fiber takedown buggy/thingy. 2 wheeled, and you pulled it kinda like a rickshaw when it's assembled. Allows the user to haul much heavier loads, but again, completely terrain dependent. (Unfortunately, I also don't recall who made/makes it).