there stuff is very good but if the skin has a reverse curve in it originally his dont..or at least the last time i saw one they didnt..
this is generally not a problem with hq to wb lower tailgates as it is a very minor curve..
as for after market gates not taking someones sitting weight thats crap..im currently 95kg and i havent bent one yet from sitting on it,,
they will however bend when loading a motorbike in a ute...