I'm pretty sure the general wisdom is to leave the truck as it is. It's one of those "tool for the job" things, and if the job involves highway speeds and lots of miles each day, it's probably best to give it a pass. On the other hand, if you are thinking of going somewhere where the pace is slower, these have made outstanding expedition trucks for many people. Also, if you are worried about the 4WD for rock crawling, etc., this won't work, and if you are staying on roads, remember that 4WD is rare among the locals on the market roads you'd use to get around. Also, FWIW, these are considered some of the better 2WD trucks for getting around; my friend Jim Ince drove a similar vehicle as an ambulance in the Himalayas and had very good things to say about it's suitability.
I like the looks, too, so I understand where you are coming from. And with enough time and money, most anything is possible, But given that parts can be expensive and experienced mechanics hard to find, I'd suggest figuring out whether this truck will do the job pretty much as it sits.