These trucks are great in the sand
I have taken several different trucks beach camping (ankle deep and deeper sand) in Matagorda TX. The M939A2 series trucks are the best I have taken because of the auto trans and power. I have taken bobbed deuces, deuces, M35A3 deuces, 800 series 5 tons and 939 series 5 tons.
When the sand transitions from hard to soft you just give it more fuel.
My ONLY complaint is that the tandems buck in really deep sand under acceleration. Adding shocks to the rear axle from the axle to the frame will stop this. What happens is the tandems are free to pivot about the cross member because there are no dampening devices (shocks).
Justin Wehring
979 997 3112