100 Series, no debate. My father has a '16 T4R SR5 4WD. My uncle has a '17 T4R TRD Pro. My aunt has a '17 T4R TRD Trail. I've driven all of those and they are nice and very capable as well. But, my father, uncle and aunt have all commented how my '98 just feels "solid" and like it can go over and through anything. It's noticeably quieter than the T4R with much greater visibility. I can cruise on the highway at 75mph and have conversations with backseat passengers without raising our voices. This, despite the fact I have numerous adornments on my rig that would normally cause TONS of wind noise. Riding in my relatives' T4Rs, it's noticeable how much more road/wind noise there is. The materials on my 98 LX, even though they are nearly 20 years older than my relatives' T4Rs, just feels nicer and more durable (and have proven to be so). The hatch/tailgate on the LandCruiser family is just better. It gives you a place to sit with overhead protection from rain. You can picnic on it. The T4R hatch provides none of that functionality. Lastly, comparing almost any of the components will reveal just how overbuilt the 100 Series is compared to a T4R. The inner tie-rods posted earlier are just one example. The LCAs on the 100 are MUCH bigger. The CV axles are night-and-day compared to the T4R. Everything is overbuilt in the 100 Series. Here's my LX for reference.
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Christ bro what do you pack when you go on these trips, looks like you've got enough gear to live offgrid for a decade. How does she drive with all that weight on?