You can try watching some videoes on YouTube. Try searching keywords like "Toyota Land Cruiser 80 series off roading"
I am sure after watching few you will find your answer.
May be you are in doubt about their off roading capabilities due to old vehicle. I'd say there are many off roaders even in countries like Australia, South Africa, USA who prefer old models more than the modern 4x4 jeeps. Reason those machines built was more oriented for reliability and strength.