As far as your questions, it really could be either or any way. Kind of like, which came first the chicken or the egg. But, for the last question, yes they did check the two pieces of frame and made sure everything was lined up and solid, before he welded. The Lippert Tech had pictures of a 5th wheel that they actually removed the upper deck, from the rest of the frame, replacing it, there are two separate pieces, very interesting to say the least.
We have high-jacked this thread, I should have posted my pictures, etc in a second thread.
Going back to the beginning, Cedar Creek did everything in a timely and professional, also they are a great bunch of people!!