Hi, Don't purchase an extended warranty for a trailer. For a car, truck, or motorhome with engines, transmissions, and differentials, you might [key word "might"] get your moneys worth. But in a trailer, what do you have left? Do you have extended warranties for your kitchen and bathroom at home? And I'm sure your house hold appliances get alot more use than the ones in your trailer.
As a shop foreman at a Ford dealer, I have personally delt with aftermarket warranty companies. You miss one oil change or don't have proof [documention] showing that you have done all of your maintenence, they will deny your claim. They also try to dictate what parts [sometimes used or junk yard] and what labor rate they pay. They also require that you authorize and pay for tear down and inspection first; Then when they deny the claim, you're stuck with a disassembled Engine, trans., A/C, Etc. and a nice bill to go with it.
If the extended warranty was offered from the manufacture, I might consider it. No matter who offers these warranties, it's big bucks for the seller as well as the company writeing these policies.