>>1453884>https://unicat.net/pdf/MD52h-UnimogU40006x6-en.pdfThat truck likely weighs 32,000 lbs fully loaded for a trip. Tandem axles can support more weight, allow for a better driving vehicle and are much stronger than a single axle. Those factors are important when said vehicle is suppose to be off road capable and intended for very remote travel. Military trucks are often 6x6 and are about as purely functional as you can get. It isn't for looks.