The travel trailer you buy (TT) is designed for the average family doing the average family outing. Most are designed for use at campgrounds (CG) with electricity and some degree of water and sewage dump. Many full hook-up CGs have all three, most have at least electricity.
The TT manufacturers design and build for a very price competitive market. They build fast with parts that will do the job. It is safe to say they do not over design their products but the industry sells over 400,000 TTs and fifth wheels (5ver) each year. The vast majority serve their owners well.
As for frames, tires, materials, appliances etc. they are universal throughout the industry. Almost all TTs in a given price range will have the same raw materials suppliers. There is no magic bullet or manufacturer.
For those who want something different or a cut above the norm, there are companies for that market also. The egg type shells such as Casita and Bigfoot or the tube like Air Stream or the more conventional models such as Lance are often mentioned as being a cut above the rest. This is also reflected in their price.
There are also the modifications made by those who boone dock, winter or desert camp and other such unique camping styles.
My suggestion is to select the floor plan with a loaded tongue weight your tow vehicle (TV) can handle, then rent one for a week or so of travel. You will learn a lot very quickly.