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.
Colonial Airstream is the first place to look. They supply all the accessories available for Airstream trailers. On this site you can find the right model to fit your trailer. With that in mind to get a bargain try secondhand sites such as eBay.
Marketplaces like RVzen offer listings of multiple dealers selling Pre-Owned Airstream Trailers.http://www.rvzen.com/rvs-for-sale/make-airstream
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.
1984 was the very last year for Airstream service manuals. For a couple of years after Airstream produced only smaller owners manuals and by the end of the 80's there was nothing for several years. vox231 on eBay has the 1984. Ask if it covers your needs. Airstream is now offering reprints of service manuals for vintage Airstream and Argosy trailers.
As there are many different brands of stock trailers, one can find information on specific brands from the manufacturer's website (e.g. Blue Hills, Southland Trailer Corp., BarT5 Trailers). For general information on stock trailers, one can find information on a general knowledge website such as Wikipedia.
For your problem I would look up WWW. trailers plus.com for all your cargo trailers and trailer information hopefully my info helps you in your search for information.
There are few sites that offer replacement wheels for your travel trailers online. One place to buy them online is http://www.easternmarine.com, they offer a huge selection of parts for travel trailers.
One of the best locations for reviews is a particular specialty site focusing on travel trailers. You can find it over at www.roamingtimes.com/traveltrailer/index.aspx
There are a number of places where you can find information on refrigerated trailers for moving I would check out sites like Home Depot and Lowes. Sears typically has some great information as well too.
You can find all information about Fruehauf trailers on the company's website www.fruehauf.com. To compare, go to www.ask.com and post the question, how do Fruehauf trailers compare to other trailers. You will find other truckers will share their opinions on truck manufacturers.
A good selection of travel trailers which are for sale can be found on many websites. These websites include "CraigsList" "RV Registry" and also "RV Trader Online".
One can find information about enclosed trailers for sale by checking out your local auto trader or looking on Craigslist. I have no idea of where else to look but I need to fill more space.