Why do you need to haul sand on a lake? Driving something that heavy on any lake with that big of a load is better left to the Corp of Engineers. They specialize in that type of work.
There use to be a site that had the army corp.of enginers specs on ice strengths.Try and google that,sorry thats the best I could do…….Personally I wouldn’t drive my pickup on 13″ .I’m guessing it would take 20+” and a bigger set of nuts to do what your asking….
Seen it done many times on the IGL’s lakes.It’s an easy way for lake front home owners to get sand for there beach area.Also seen huge loads of rock go across the ice for landscape work. Ryan Hale
7 tons is only 3 1/2 yards wounldn’t take that long a with fourwheeler and alittle trailer, couple extra guys wouldn’t hurt either, much safer and good exercise