"Daihatsu landing craft could be modified to carry weapons of up to 37 mm (1.46 inch) caliber as armament and could be uparmoured against 40 mm fire."
from:
https://en.wikipedia.org/wiki/Daihat..._landing_craft
As mentioned above, Daihatsu could be armed.
I reproduced this in SH4.
The 37 mm gun in front has the same power as the 40 mm gun of SH 4.
I have a 25mm gun in the center. This also performs anti-aircraft combat.
Hit point is lower than PT boat.
Armor is thinner than PT boat, there is no survival performance.
However, it will appear as a historic Japanese patrol boat and will make your SH4 more enjoyable.
Let's get on the PT boat and fight with the armed Daihatsu!