I've put a million+ miles on Toyota's, driven them around the world twice, raced the Baja 1000, Vegas to Reno, competed in competitive rock-crawling and own Toyota's ranging from 1965 (Stout) to 2008 (URJ200) and have never had a
single failed head gasket. I sell & install Land Cruiser parts to hundreds of Land Cruiser owners each week, I sell more 1157 bulbs in day than I do head gaskets in a year. I think you've created a statistic in your head
The 3.8's were failing in the first year... If/when a Toyota head gasket would have failed in that time frame, they too would have "fixed it" no? The only Land Cruiser that perhaps has a head gasket preventative maintenance mantra is the FZJ80 (93-97) and failure rates of head gaskets are in the 5% range and in the 175-225k miles range. The Jeep 4.0L was known to
have it's own issues... Land Cruiser owners just fix them before they have to be towed home