[Suhiir]

Yeah, amphibious APCs take the age old tank problem of balancing armor, weapons, and speed to a whole new level because in spite of some manufacturers "cheating" by floating totally unloaded vehicles they have to be able to float with a combat load and passengers to be of any practical use.

You also have to take into account the total volume and mass of the vehicles required to move a given size landing force because without ships to get them where you need them while useful for river crossings they're useless as an amphibious asset.