Lol I don't want this to go into a bash the engineer fest. If you had a hitch that was blessed by an engineer it would look better in court but an attorney could make quick work of that engineer as well.
Personally I would be content with a good fabricator telling me it will be fine.
Ok I only have a few engineer stories :) before I was a full time fireman I was a maintenance mechanic. Our companies engineer would have things made up for the plant and we would be tasked with beating and fabbing into the finished product! I won't lump all engineers just because of that one guy though. Oh wait there's the engineers that design our fire trucks......
Lol anyways I just want a safe and trouble free experience. First it has to warm up enough to crawl under rv to see what's possible then get some opinions from local welder. I know a couple engineers as well. I'll see what they have to say. Thanks all.