Seiga 6x6 for reed harvester marketed by Vnad Ltd, Hungary. There are 4x4, 6x6 and 8x8 models. Reeds are sold for building house reed roofs. http://hajduboszormeny.olx.hu/seiga-nadarato-4x4-6x6-reed-harveter-iid-14800424
ZIL132 6x6 with Hoop Tyres dates from 1961. It could run in 80 cm of fresh snow. It had overload problem of transmission and proto burnt. No suspension. Speed 50 km/h. http://denisovets.narod.ru/zil/zilpages/zil132.html
Zil 136 6X6 amphibian proto, 1957, with hydrojet, 145 ch, transmission to front and rear wheels from medium axle. It lacked of stability on soft snow and the project was dropped. . http://denisovets.narod.ru/zil/zilpages/zil136_1957year.html
ZIL 132 R tests in 1974 for agricultural work. 40-45 km/h, existed also versions ZIL 132 RS : fifth wheel, ZIL 132 PC : dump truck, ZIL 132 RM is the final product, 7,5 t. http://denisovets.narod.ru/zil/zilpages/zil132r.htm
Ermelya-Arctic, Ice Cruise Marine for MLAE 2008 to reach North Pole. Built in 2005-2007 at Moscow by Elaguine, the empty mass was 1500kg, payload 600kg, ground pressure 01 kgf/cm², speed 50 km/h, and power was 75 hp by Toyota engine.
ATV Lytvyn of Litvina, since 2008 in Belarus, is a 6x6 low ground pressure tires for Great North and Siberia. Empty : 2.5 T, payload : 1 T, Kubota engine : 49 hp, speed : 45 km/h. http://www.litvina.com/