in massive structures - an effort to explain observations of effects seen far from the edge, in masses presumed to be in static condition / equilibrium. But apparently weren't.
My instinct would be Helmholzian: the "troops in-step crossing shaky bridges" resonance effect.
If the effect is described as a result of, "just going faster" - that would seem to negate this thought, except: during (even small rates of) acceleration - successive resonances of the truck-ice-water system could occur, do the mischief via the magic of nodes.
If due solely to exact speed maintained at resonance - then the truck would leave a trail of mangled ice pieces behind (?)
It is a dynamic system.
Experiments needed.