To summon a new invisible chest minecart run the next command:
/function im_3:summon_invisible/chest_minecart {pos:"~ ~ ~", noGravity:"true", silent:"true", invulnerable:"true", tags:""}


You can change pos, noGravity, silent, invulnerable and add tags to customize your minecarts:

• • pos: x y z coordinates (integers and/or '~')

• • noGravity, silent and invulnerable: true or false

• • tags: custom tags separated with comas

You can also turn a normal minecart into an invisible minecart just by adding the tag "invisible_minecart" and removing, if it has, the "im_set" one.

Once you have download both, the DataPack and the ResourcePack, you have to save them in .minecraft/saves/world_name/datapacks and .minecraft/resourcepacks folder respectively.