From GameWatcher: “Sooner or later Red Dead Redemption 2 will inevitably have you hunting and, as it turns out, your horse can only carry a limited amount of game. With the Hunting Wagon mod, however, you’ll find yourself heading back to camp less often.
As its name suggests, the Hunting Wagon mod adds a hunting wagon to your camp in Red Dead Redemption 2, letting you use it when you’re heading out to hunt.”
Source: N4G PC Red Dead Redemption 2s Hunting Wagon Mod Lets You Carry More Game