Ya see, the thing about LST's, they didn't make beach assaults..
They came in after the enemy had been pushed off the beach..
Heavy Vehicles, where below deck, unable to get in the fight!
For the game purpose, these choices seem more likely..
LCM, (Landing Craft Medium) holds a single Sherman, that cannot
fire its gun because of the wooden bottom.. No way to shoot back!
LCT, (Landing Craft Tank) various models held between 4 and 12
Tanks/Vehicles in the open, and the Vehicles Could fire their weapons
while aboard.. Had 2 single 20 Oerlikons for AA, along with the massed
machineguns of the vehicles (M16 eh?).. Also would be a nice battery of
Sherman guns vs the Tanks defending on Shore.. With the Proper mix
of Vehicles, it would be a potent gunboat.. Steel but unarmored, big enough
to take some punishment before sinking, make for a fairly even fight!
This Idea isn't new, been hammered alot, by many people!
Most people want "Something" to put tanks over the beach..
And dedicated Invasion fleets to get the CV away from the shoreline..
Still mega +1