The owner had already decided on thin-wall 3" tubing for most of it, so it ended up being all manner of electrodes:
1/8" 6011 and 3/32" 7018 for the vertical welds (6011 downhill and 7018 uphill) because the material couldn't take the heat of a 1/8 " 7018 at the vertical joints.
Used 1/8" 7018 on all the flat, horizontal, and overheads.
Some 6011 with 7018 caps where I had thicker material (tie-down pad eyes, steel rollers, etc)
The machine started acting up on me (client's Lincoln Vantage) so I finished the last of it with .035 FCAW-S from my little machine which turned out to be damn work horse.
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@powdahound76 had asked for an update as well. That's her as she's sits now. The Client was very specific on what he wanted the ramp to be, so that's what he got. It works well with all of his equipment but he's now hauling equipment for other people and has found some flaws to his design so he wants it "modified".
We had a good laugh when he said he wanted some "small changes" because everything on that ramp is multi-pass welded to the frame at every possible ppint. Nothing on that ramp was meant to ever move again, so he understands that it's going to be a fairly major operation to modify it.
The guy I built it for wants 10 more of them, but with custom 18 yard dump-bodies; in the meantime he hired me to work on a steel building for him to keep me "on the clock" until he's ready to do the next trailers.