How did gun craft alter trim for shore fire?

Did fire-support craft counterflood or alter their trim to increase gun elevation?

Yes. Crews counterflooded, beached craft, and changed weight distribution to obtain useful firing angles.

Counterflooding could increase gun elevation. Landing-craft crews also beached their vessels or shifted weight to obtain a shot. These improvised changes supplemented formal doctrine when beach geometry or a target demanded a different trim. Commanders adapted hull, ballast, and position rather than using each design exactly as delivered.