I ran logging trucks for 10 years and each year we routinely did water crossings(river) with loads ranging from 72,000kg gross weight to as much as 112,000kgs depending on our trailer configurations/end destination. Our crossings were monitored daily. For the highway configured loads(74,000kg max) we had to have 36" ice minimum and when we ran off-road configuration(10'-12' wide and 14'-6" high) we were always 110,000 to 112,000kgs gross weight on a crossing that was flooded to a minimum thickness of 54". We ran 5 axle trailers, 4 fixed and one airlift. We made sure all 5 were down and we crossed at a maximum speed of 10km/h with only one truck even empty allowed on the ice at the same time. As for personal use I feel safe with my pickup on 12" good solid clear ice. I won't venture forth until there is 12" consistently.
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