The insurance carrier for the Subcontractor must have an A.M Best Rating of A- or better and the rating must be listed in the Certificate of Insurance. All trade contractors need to complete our Subcontractor Qualification Application to be eligible to bid on our projects and contract with Clark.Our experienced technicians and engineers can help you design, bid, and build a customized cabling and technology solution that meets all your requirements. Request for Proposal. All proposer's must fill out, sign and submit the "Certification Regarding Debarment,. GUIDELINES – The advertisement must be published at least once and not less than 7 days before a bid opening. Clark. Bid Request Process. The purchaser should provide each potential bidder with a written, detailed Request For Proposal (RFP).