Actually, our rig has 30A connection and two 15A outlets.
The outlet shown in the left photo is for 15A; the right photo is for 20A. Both should be able to handle their respective amount of current. That being said, there is always the manufacturer cutting corners by using substandard size wire. Do you trust your coach mfr? Also there is the point of being in a moving vehicle and movement can cause anything to fail. Again, how wires, etc are installed has a large influence on the reliability of the installation. I would think the RVIA standards would help, but is there any enforcement like inspectors for brick and mortar homes? (Don't get me going on the reliability of government inspectors.)