[Marcello]

I would add that with North Korea you have an additional option for crossing rivers.
The GSP ferry you can buy in the Misc section from 1969 onwards.
It has the same land speed of a barge carrier, some armor (it is a bit of a necessary fudge but it means it have a chance against artillery) and can move both on land and on water (albeit a bit slower than a barge in water) without the need to be loaded and offloaded.