I know about fatique. My partner at work handled a semi with a Benson All aluminum flat bed traielr with a 45000 lb steel coil on it. It snapped the frame in the middle pulling in a drive..... My Featherlite does have a steel hitch and axle cradle in it for strength in those area's. yes, there is more aluminum so weight savings is not that much. I bought because of the fact I am using primarily in the winter for snowmobile racing and I see all the stel frame aluminum skin trailers needing new skins in about 5 years, plus the Featehrlite reputation. If I just used in summer with no salt maight have saved about $7000. 00 and went steel. BUT resale is also there better with aluminum too...