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Remember for RVs, the manufacture does not have to have a certified welder to weld on a RV frame, so you get whoever was welding that particular day, penetration, undercut, to high a temp, not enough heat, who cares the frames are not likely quality controlled like the Automotive manufacturing, so some joints may not even be welded and this has happened at the factories. Again if these frames were designed and engineered for the loads, built and quality controlled one would have no problem. This must be very costly to both the manufacture and customer after the unit is built and then have to tear into the body. Somehow the "Do It Right The First Time" is missing??? Growing up and living in the Engineering field, these types of continual failures really make it difficult to understand how the manufactures get away with it and yet have to live with costly warranty repairs.
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