Another options would be to have a type of units - caravans, for instance - provide the same (non-stacking) bonus. (That is a unit that would naturally improve logistics, at least.). That would be better if it was a limited version of organized though.
This would be good, actually. Oh wait, they have this already: Journeyman's Cloaks and Ranger's Packs.
I like the ability as is with the cost as is. It's not overpowered... unless you buy like 20 'rings of endurance' and 'amulets of roaming'.
Has a suggestion been made to limit the number of rings a character has to... oh, say the number of fingers they have? Just a thought.
But of course unlimited amulets should be left alone. I mean 'Mr. T' anyone? right? am I right?... I'm right.
Uh...huh. Or better yet you can't stack duplicate items. Sure you can have one of each kind of ring, but two rings of endurance won't happen. Or 30 for that matter.