Personal experience.
Had a toyota 93 pick up with the 22r. Must be wright with some of the previous afirmation about part durability, cause after a given time, all the parts started bracking down at the same time. Engin had been loosing coolant from almost the enfant years, but could not find it, head gasket was change was I took possession of it, timing chain, timing chain guide was also just gone, alternator, valve cover gasket leaked on the clutch and made it slip, rust, water infiltration on the fuse panel, brake line, all of them, gaz fuel line from the tank, other hole in the cabin metal, water pump, hand brake cable and parts. The truck was never off road and was still on the original size tire. Driven by my dad and later by me as dd and around to house duty.
Was the tird yota vehicule that I've touch and all of them got weird isues compared to the yj.
My jeep, a 95 yj 4,0l I6 manual as well, but driven off road for half its life, same milage, still going, couple of units bearing, water pump, radiator, some u joints a bit off rust, gaz pump. But is is still going, and way way easier to work on, and bigger tires that the toy ever saw.
So to me the toy was not more reliable, but mostly a pain to work on compare to the jeep.
A friend of mine modified is LC fj40 with bigger tire and bigger motor, had to change every mechanical component to gm and other, cause nothing was holding to the abuse. Incuding front and rear diff.
So to me, chose your poison. I stick with my jeep thing. By the way, the yj is still runing strong, but decided to put it in retierment to replace it with a TJ unlimited. Being in the rust belt, needed to go with a frame off to replace some of the boddy mount and frame support. No idea where the toy is now, was getting tired to work on it. And since it was my dd, needed more reliability.
So what can be done to a wrangler to make is as reliable as a land cruiser, good question, I'm not that good of a judge.
But from what I have heard, keep it as stock as possible, like a land cruiser. If you want to make it bigger, upgrade accordingly.