First, why aren't they all solid? That big hole really can't be that much of a weight savings, and at least in my AS, they're not used to run any systems through. The only thing in my trailer that runs between the floor and belly pan is the electric brake wiring, and that's on the inside of the frame rails. That big hole also has to compromise the strength, too.
In the process of shopping around, I noticed that at least one supplier (OODM) lists a solid outrigger for the wheel wells, but with a notch at the top, next to the frame. They're specific that these notched outriggers are for the older (non-widebody) trailers. So what's the purpose of the notch? Or is this a mistake on their web-site, and the notched ones really belong to the later model trailers?
Finally, (for now
), what's the proper length? Mine vary, most seem to be about 14 5/8" from the frame to the tip, although the step outriggers are 15". OODM lists them as either 14.5" or 14.75", depending on age.
Sorry for all the questions, but I have more than a few that need replacing on my frame, mostly rust damage. I'd like to be sure I get the right part for the job