As above, rust is the killer of these vehicles, if you can find one with a solid chassis suspension and rear axle and keep it that way then these are brilliant vehicles that can last for many years and cover high mileages.
Note the vehicle in the link appears to be on aftermarket wheels, that might be for looks (though personally the OE wheels when in good nick look superb) but one wonders if they got so corroded they were scrapped, which would make me want even more to see underneath.
The bodies on these are resilient to corrosion, except for the inner sills underneath between the chassis and side steps, these get heavy battering from road grit etc and can if left untreated corrode through so as well as the chassis and rear axle etc give those inner sills a good look over.
Obviously you'll maintain the engine well (you can see the oil pick up strainer on the Diesel through the oil drain hole) and if you look after the rest of the drivetrain with fresh oils every now and again, and maintain the brakes meticulously (these vehicles need regular brake cleaning/lubing) then they are in my opinion mechanically one of the best long term bets out there.
I looked at a few 100's before buying my 120, again underbody corrosion is an issue, they are not as heavily made or as simple as the 80 series, or 70 come to that, and i personally find the fairly narrow 120 a good package overall whilst still a comfortable and roomy place to be, se have dogs and the side hinged door of the 120 suits us better anyway.
If i could have found a 100 in as good condition as my 120 i would have bought it, unfortunately from what i've seen they seem to suffer more neglect from first owners than 120's, and the good examples fetch serious money.
The thing with those American videos is they are mostly in warm states which don't use thousands of tons of road salt, without seeing salt these LC's will last forever, its salt that kills them, have a look at some videos of cars that live in areas that see heavy winter road salting, the corrosion underneath will shock you, the chassis on Tacomas and Tundras riddled in rust in only a few years.
I'd also have another Hilux 3.0 litre auto if the right one came along, VED in Britain is more favourable to commercial vehicles.