A logistics tender can be part of your procurement strategy, but there are some golden rules to follow: 

tender shall be beneficial to both clients and suppliers, shippers should offer volume committment  
all suppliers receive the same info and follow the same rules, otherwise offering is not fully comparable  
without a solid financial starting point, incoming offers are not actually assessable  
must be illimitate, not to lose any opportunity 
suppliers have not to make assumptions, all services specifications must be described in the possible booklet.  
protect what you negotiated with solid written logistics  contracts, the legislator protects more the carriers than the shippers

Logistics Tenders are Kelmer core business since 2009, we can coach or manage, try us!