You don't need a bunch of fancy (heavy) gear to do "overlanding." It used to be called car camping and my parents criss-crossed mexico and the US in a chrysler mini van, putting most people who now consider themselves "overlanders" to shame. It's pretty easy--buy a tent at your local outdoor store, a camping stove and a good cooler, then throw them in the back and drive.
You don't need a lift--a stock 80 is plenty capable to get where you want to go. You don't even need big tires--I have wheeled many of the tougher trails around CO and UT on 265's (32's). You definitely don't need bumpers and such., and in a 3fe 80, that's probably a good area to avoid.
And stop using the word "invest." These trucks are money pits, get used to it. Not knocking the 80, putting money into any vehicle is a losing proposition. Investments create money, liabilities consume money. If the truck is in good shape interior/exterior wise, it is less of a losing proposition than if it's a clapped out junker, but it's still a losing proposition
And be prepared to learn how to fix it yourself. For whatever reason, mechanics like to rob 80 owners more so than other vehicles.