Over time, I have read several threads about the weight of aluminum vs. steel.  I always thought aluminum would be lighter.

The Sooner I am looking at weighs 6080.

This Trails West (steel) trailer http://www.horsetrailerworld.com/home/trailerdetail.asp?ID=232056 weighs 5610 - it's a bit longer and it's lighter!  Why would this be?

This Featherlite http://www.horsetrailerworld.com/home/trailerdetail.asp?ID=239750 weighs 5200 pounds.

This Exiss event http://www.horsetrailerworld.com/home/trailerdetail.asp?ID=245684 weighs 5320.

I am assuming that these trailers are similar (all four horse, no living quarters). 

Why would the Sooner weigh so much more than the Featherlite and Exiss Event?  Why would the Sooner weigh more than the steel Trails West?

Is there structural difference between these trailers to account for the weight?

Thanks.

You've given all kinds of examples except.... "The Sooner I'm looking at". Got a picture of that one? I got a three horse, Silver Star, Star Lite Supreme, that has a stud divider, ramp over full doors, 7' DR, 4' short wall mid tack that weighs just shy of 6600# empty and it's an all aluminum trailer. Alot of these folks will list these trailers on the light side..... If it's a lighter trailer, folks will have more of a tendency to buy it.

 I'll be willing to bet all three you have shown weigh 6000# maybe more!!! Most of the mfg's use a S.W.A.G. engineer's estimate of the materials used to determine a trailers weight. Check out the GORE trailer website. They give you the trailers weight, then the weight on the axles and the weight on the tongue..... They list it as an approximate weight..

Example from the GORE website..

Steel Chassis - For Added Strength) Outside Width 7'9"  Width: 72" (79" Wide Model Available) Height from Ground up: 8'3" 7' for Horses to Stand 5' Head Room 5' Dressing Area
(72' Wide) Approximate Weight: 3420 lbs.  Hooked to Truck: 2660 lbs.  Hitch Weight: 760 lbs.
(79" Wide) Approximate Weight: 3640 lbs. Hooked to Truck: 2880 lbs. Hitch Weight: 760 lbs.

Here's the link to the Sooner I'm looking at:  http://www.horsetrailerworld.com/home/trailerdetail.asp?ID=187774

I'll try to find that site you've suggested.  I was mostly surprised that the listed weight for the steel trailer was so much lighter and how much heavier the Sooner was listed at compared to the other two aluminum trailers.  I was not sure if this meant the Sooner was made out of thicker, heavier parts or if it was just a normal variation one would see.

Thank you.