:doh:
OP, you're not overlanding. You're not expeditioning. You're not even really offroading. You're driving on dirt roads, is what you're doing. You'll know it when you're overlanding because you'll have to hire a local guide and carry 20 gallons of spare fuel, or have to have a rifle and an RTT so you don't get eaten by hyenas. The technical term for driving your truck into remote high mountain lakes is "going fishing", and the only mods you need for that are a passable set of AT tires and a good map.