Yes, using a bonding plug makes it safer by providing a low resistance path back to the generator to trip the breaker in the generator if a short to the metal case of an appliance inside the RV or the generator itself occurs.
When it comes to the ground rod system in a residential system, it is there for voltage stabilization and surge dissipation, not to trip breakers. In fact, if the neutral and grounding electrode system are not bonded in the service panel you could connect a hot conductor straight to the ground rod and it will not trip the breaker. You need the bonding in the panel to provide a path back to the transformer for that to happen. You get that path when the ground and neutral are bonded in the service panel, completing the circuit back to the utility transformer's neutral point.