What Metal For Trailer Sides

I was wondering if anyone has a good idea for metal sides for a trailer that I am building.
It will be held by stake pockets (either wood or metal, haven't decided yet). This way I can use it as a flat bed also. Needs to be about 24" high.
I have searched and searched and can't seem to find a metal other than regular flat metal from a welding shop. I would like something like the trailer pictured.
Thanks for any advise.

 

It depends on what you're hauling and how it's supported. Boxes and other bulky stuff can be held in with expanded metal. Stones and mulch will need sheet metal. If you take care of it, aluminum will cut down on the weight and is easy to work with. Either way you go, it will need a framework to support it(like the picture you posted of the wood sided trailer)
A good welding supply shop should be able to get anything you need.

 

Yeah I need it to be solid for hauling sand, dirt, mulch etc. Like I said it will be held in place with stake pockets with probably 2x4's.

 

Aluminum on sides and bed with two coats of bedliner.
You will need beefy axles to carry much in the way of sand, rocks. Not so much for mulch.

 

I think I found something. Went to a different welding shop and they had some metal decking left over from another job. It's used for roofing and flooring in commercial buildings. Sometimes it is filled with concrete for floors.
Said he would sell it for $25 for 36" x 25' sheet. Cheaper that treated 2x.
Now I need to get this on the trailer, painted, and new lights wired up and Im done. YAY!

Similiar to this but not as many or as deep of valleys.

 

Looks like a truck bed for your trailer.

 

I wouldn't use that stuff. Structurally, it's sound enough but not really suited for your application. There are deckings that have much less of a valley though if your set on that stuff. On the plus side it is easy to work with. If it were my trailer, I'd use heavy angle and make a structural frame and infill it with 1 x 6's. The steel frame would support the wood and it'd be easy to re-deck if you needed to down the line. The wood could also be removed and you'd have an open sided trailer (Besides the angle iron frame).

 

He's planning on a removable side trailer. Wood is heavier and not as strong as couragated steel. He's using a differant profile steel than the picture.
Removable aluminum sides in stake pockets would be easier to handle by one person. It's expensive but worth it.
I think he's got a good plan, so far.