Looking over my last post, it occurred to me how stupid it is to have "tents" be expendable items in a traditional RPG. It's a fuggin' tent! It's not like a potion where after you use it once it's useless. Do not make tents expendable. Same goes for "sleeping bags".
Tents and sleeping bags could have a limited number of uses (say, 20) to simulate wear and tear. If wear and tear is implemented, worn down items should sell for less.
Tents could come in sizes. For example, a one-man tent will suit you fine if you're the only one in your party, but you'd need to upgrade to another size tent if you get another party member. (or just use sleeping bags). If this is implemented, remember that most characters in a traditional RPG should come with their own sleeping bag or tent when they join your party.