I am genuinely curious if you have ever driven a Prado in another country ? I am not a mechanic, nor an expert.... but I can talk from experience that the Land Cruiser Prados (that's the full name ) are also exceptional vehicles, and also last "forever" as our beloved LC's.
You are right, it is going to be VERY hard to differentiate between a T4R 6th Gen and a LC250 ... for us -hard core Toyota geeks- , because we know the LC250 , aka 2024 Land Cruiser, is actually a Land Cruiser Prado; while for the "regular Joe", it will be the 2024 Land Cruiser, so Toyota very smartly played an ace game there. In countries where the Land Cruiser Prado AND T4R 5th Gen is sold, it is a tricky perspective which one to get. Part of the "differentiation" comes from where the vehicle is coming / built from: if the car is really "Japanese made and imported", it will cost more than if it is not. Still many folks value "Made in Japan", so they get the expensive option... other folks want but can't, yet still trust Toyota and want the Toyota truck, so they go for the "cheaper" option (keep in mind, NONE are cheap at all, either are VERY expensive trucks ). We never had that problem here because (1) there has not been a real "Toyota Land Cruiser Prado" vs T4R, except that we know the GX IS A PRADO, just with the most expensive options, BUT, both (2) are made in Japan. Funny how the T4R could be more expensive than a GX here when car for car, the GX can been seen as A BEEFIER car than the T4R, but as market and perception goes, the T4R is cooler and more "rough". All this is to say that if you imagine a striped down GX versión and try to compare it to the T4R, you could have a hard time seeing how they compete in this market, but Toyota never let that happened because they brought us the Prado as a GX (expensive, luxury, low departure/approach angles etc etc ). But remember, they will sell the LC250 as LAND CRUISER, so there "will not be " an overlap ... yet, there will be for us, geeks. There will be different, enough as the GX -Aka rich Prado- is different to a T4R, awesome both, but they ARE different. But for the majority of people, they will be REALLY different because one is a 4Runner the other one is a LAND CRUISER

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I think I have posted before LC100 vs LC250, and I think the change will be in some areas evolutionary and in others revolutionary. Back in the day when the LC100 was launched, MANY said it was a waste because it wasn't a LC80... wasn't really ? I don't think so ... same here. It WILL NOT BE A LC300, but we know that. It won't have all the things we want. But will also bring positive things... I won't repeat them. I have seen what Prados are capable, and have seen how durables they could be, so I am confident the 2024 Land Cruiser Prado would be a good vehicle, accepting what IT IS and what IT IS NOT. I could very well be a successor from someone that has a LC100. It might be the successor of both my current LC80 and LC200 if the dealers don't sell above MRSP.
Cheers.