A few things that I did for my own benefit in a riverine campaign with the USMC in Vietnam. I realise that very few will use them but for those few:
"Tango" Boat - ATC (H), Troop Carrier with elevated Helipad
Moored Artillery Barge with 2x 105mm Howitzer
Moored "Ammi" Barge with Helipads
Empty "Ammi" barge
Attached .zip contains all .bmp files: