The site foodtrailers dot com has all the reviews available for food concession trailers in all areas. I would visit that site to view and contribute to those blogs.
Great Dane trailers are produced for the transportation of food products whether the food needs to be chilled or dry, there are trailers that can accommodate these needs.
Youtube has trailers.
Catering trailers are used to help a person sell their business in food. Some examples would be a hot dog stand or a pretzel stand. This is where they setup what they are selling and it can be moved around.
There are many places where one can find more information about refrigerated trailers. One can find information about refrigerated trailers at popular on the web sources such as Polarking and Great Dane Trailers.
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Amusement Trader, eBay, Food Cart USA, Catering Truck, and even Youtube have ads for catering trailers. California Cart Builders and Custom Concession Trailer both offer to build such trailers to your specifications.
One can find information about Airstream travel trailers on the official Airstream website. There one can find details of all of their trailers and the prices they are sold for.
You can find used gooseneck trailers at regular retailers - just ask to see their 'used' section, through personal sale websites like Kijiji, or various other stores and locations.
You can find concession trailers for sale online from the Commercial Truck Trader website. Alternatively, you can also find these trailers for sale from websites such as Used Vending.
The best place to find sales on cattle trailers would be local ads in newspapers. Another good place would be to go to local businesses that sell cattle equipment, if they businesses themselves don't have a sale, then there will probably be a bulletin board with people listing sales of their own trailers.
I need some utility trailers. Can I find free plans to make these trailers?