Experienced off road drivers don't use snow chains in snow they use years of knowledge and common sense, I did 9 years of off roading during the 90's when at that time I owned a Jeep CJ7 with a 350 AMC 5.9 v8 engine and could tackle any terrain including hill climbing on soft sand and also serious hill climbing in snowy conditions, the trick was to maintain idle speed and lower tyre pressures and one almost never got stuck, the downhill runs were the most dangerous but always successful at lowest possible revs in lowest gear.
Hope you understand all this Arthur! 