Some ways to find used office trailers are leasing, renting or buying from places such as Rock & Dirt, Ritchie Bros. Auctioneers and AutoBidMaster.com. These companies sell used office trailers from different manufacturers such as Ramos, Atco and Altec.
Visit RBAuction.com for office trailer auctions with no reserve prices and minimum bids. Auctions in the United States happen in locations such as Houston, TX; Tipton, CA; Phoenix, AZ and Atlanta, GA.
Auto Bid Master has a large contingent of salvage office trailers. For example, as of August 2015, they still had a 1987 ARO TRAILER for sale at a bid of $875 with two days remaining.