I've seen both photos of both trucks in Korea.
Fine Molds at one time made 1/35 soft and hard cab versions of the Isuzu Type 96 6-wheel cargo truck. The photos I've seen all showed the soft cab version. Doesn't mean the hard cab version was not used there, but I've not seen a photo of it. These trucks were in ROKA service.
Hasegawa makes a 1/48 Type 97 four-wheel Isuzu cargo truck. The photo I've seen showed a hard can version (unlike the kit) and it was in civilian government service, not military.
Numerous Japanese Type 94 75mm Mountain Howitzers were used by the NKPA. Often the iron or steel rimmed wooden wheels had rubber vehicle tires crudely cut and sewn together. Life photos showed such modifications, but I can't locate a link now.
Likely other Japanese artillery pieces were used in Korea as well, it's just that photos are scarce.
A lot of Japanese small arms were used in Korea as well, by both sides. ROK forces were reequipped with US weapons fairly quickly.