Marketplaces like RVzen offer listings of multiple dealers selling Pre-Owned Airstream Trailers.
http://www.rvzen.com/rvs-for-sale/make-airstream
Any discussion of high quality travel trailers should include looking at Airstream. You can look at the quality specs and details of most Airstream Travel Trailers on a site like http://www.batesrv.com. They claim to have the largest selection of RVs in Floirda and are the Largest Airtsream Dealer in the US.
Airstream trailers can be bought mainly directly from the manufacturer themselves or from luxury trailer dealerships across the nation. Your best bet would be to checkout airstreams own website for further details.
The best website for used concession trailers is probably eBay. There are almost always many concession trailers for sale there at great prices.
U-Haul has the best prices for rental trailers in the Houston area. There are also multiple convenient U-Haul locations throughout Houston.
Salt water is damaging to any boat trailer. The best trailers you can get if you plan on venturing into salt water are galvanized or aluminum boats. All Marine Trailers Inc. has great quality aluminum boat trailers at low prices. I can guarantee you'll be happy with their custom made trailers. Give them a call at (786)470-0359
calloway preowned
There are many different brands of trailers. However, the brand that is best for transporting horses is Exiss.
There's some really great resources out there for buying used cargo trailers. The main point is, as always, going to be shopping around to an extent. But one of the best is trailershopper.com
Preowned Ford Trucks can be found in many used car dealer lots. You must be careful in the terms that you can get scammed. It is best to purchase this from a car dealer themselves.
PJ brand trailers are considered some of the best. There's some subjectivity involved, but among people who use dump trailers they're considered some of the best.
The best place to look for tractor trailers for sale is on Truck Paper, a company that hosts used trucks and trailers around the world. Their website allows buyers to find listings of sellers selling tractor trailers.
Keep your Airstream clean by washing it about once a month, more if it is being used in muddy conditions. Always use a soft cloth and gentle non-abrasive cleanser. Rub lightly with the grain of the aluminum, never against it. Also, in the spring and fall choose a mild wax to use on your Airstream, to give your exterior extra longevity.