A Request for Proposals (RFP) from the Minnesota Department of Commerce is a formal invitation to potential contractors or grantees to submit a proposal. – Request for a Certificate of Liability Insurance from the vendor.Find information about contracting with Hennepin County, including processes, forms, and diversity rules for goods and biddable services. Request for Bids beginning on page 6 will be included in the contract. Complete this form and return it with your bid or proposal. Pre-letting (how to bid). Steps.