OK - check out this general info site from TOYO - located at the Main Japan site...
http://www.toyojapan.com/tires/tire_talk.html
NOW look at the 4wd causes fires
http://www.toyojapan.com/tires/pdf/TTT_02.pdf
http://www.toyojapan.com/tires/tire_talk.html
NOW look at the 4wd causes fires
http://www.toyojapan.com/tires/pdf/TTT_02.pdf