I have personally sat at a "strat" target (ie; ammo depot, radar facility, etc.) for a few hours in an Osti, killing the trains that resup it. BTW trains run at exactly ten minute intervals, not sure about truck convoys.
Anyways, the point I was tryin to make is that after sitting at a downed strat target (was at 0%) for those two hours, I helped to delay the resup time by about 40-50%. So to answer your question,YES, it will have an impact, even if only a slight advantage is gained like more time for goon makes it worth it to me.
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A8Chustr