Re: should I buy
I think everything should have a 1 year warranty. Air conditioners, water heaters, furnaces, etc. are generally warranted by the manufacturers.
You really need to find out what the trailer weighs. Trailer weights are based on basic, dry weight. Any options, such as a/c, awning television set, microwave and for some manufacturers, even the spare tire is optional. The weights of these options, plus the weight of 2 full propane tanks can add to the basic dry weight in a flash....
Then you need to look at your owners manual for the real towing capacity of your truck. Again, that towing capacity is based on an empty truck, with a couple of gallons of gas and a 150 lb driver. When you add passengers, tools, and other things in the truck plus a 50 lb weight distributing hitch, you have to deduct ALL that weight from the trucks towing capacity. These things can become quite complicated, especially when towing a trailer with a marginal vehicle.
Also, towing in the flatlands of Kansas is quite different from the Smoky Mountains or the Rocky's. I'm neither trying to scare nor discourage you, but to make sure that when you do get a travel trailer, you'll be safe and comfortable towing it, otherwise it will become a very expensive driveway ornament...
Good Luck....