Just finished camping at Beardsley on Father's Day and explored a few of the forest service roads up there. It was nice and quiet but the water is low.
probably coulda cleaned the metal off a bit better before welding..
I flap wheeled the end sat the joints and it .045 flux core wire. Yes I could have cleaned it up some more, but no I am not worried about it failing. There will be so many tie in points between cage and unibody that it will hold up to anything short of being driven off a cliff.
I'm a self taught welder, but I'm a commercial/industrial electrician by trade. The professional welders don't clean the steel before they weld half the time and their welds get inspected and xrayed. If you are on a fab table with sheilding gas then by all means clean it up and make pretty welds. Outside in the middle of a wind storm running big flux core you're probably gonna go over the welds with a flap wheel after anyway.