In general, a request for proposal is a document that articulates the specific business requirements of a company.
It typically calls for customized solutions and pricing bids from various vendors to meet those specific requirements. In response, interested vendors send proposals that include pricing quotations. The pricing could either be a fixed amount, a variable amount, or a floating price based on several factors.
In the logistics and freight industry, truckload RFPs are requests for proposals by businesses with logistical needs and they are “broadcasted” to truckload freight vendors. The RFP document details the shipment needs of the company, such as what they are shipping, where they are shipping, how much they are shipping, and so on.
Vendors often use standard RFP templates to streamline the process.
https://www.freightquote.com/blog/creating-an-rfp-rfq-infographic/