No, typical RV rental does not come with any kitchen supplies. Some RV owners may offer supplies e.g. CruiseAmerica.com offers a ‘Kitchen Provisioning Kit’ at an extra price. (Check out this link for more details: https://www.cruiseamerica.com/rent/webres/kpk)
Our opinion is that you are better off bringing your own supplies from home including disposable plates and cups. In a rare situation if you are flying in and then renting an RV even then you may be better off making a short stop at any Walmart on your destination and purchase what you need.
If you are hard pressed for time then consider the option of ordering online and have everything ready for pick up from your desired local Walmart.