Just finished my new trailer. Rather than steel or aluminum, I chose to laminate Douglas fir for the 1" square struts. This trailer is quite strong and very, very light. I used a rather long tongue so I can haul 6-8' boards and not have them stick out the back too far and thus give a negative tongue weight. You can't see it in the picture, but there is a 1" angle aluminum reinforcing piece that goes all the way back to the wheel mount. I know I can jump up and down on the rails without them breaking, and I can stand in the bed. Here is the link to this trailer on Wike's website.