God only knows how many small privately built landing craft would be "drafted" by the US or Canada. These bad boys are all over the Great Lakes region and VERY common in both Alaska and the Bayou.
https://youtu.be/vMHAj9T_2-Q
https://youtu.be/bRn1UyfAVbY
Probably the most popular COMMERCIAL version. I see these everywhere they are working for oil, logging, or fishing around the Great Lakes
https://youtu.be/VuY96xEHP_E