We're done with the installation and we did not need to weld anything, so far. Geri is reinstalling the rear leveling jacks and the black holding tank drain hose carrier.
The kit we bought was a multi-fit Reese hitch receiver system, that needed modification, including adding a few parts and hardware that were not in the kit. It still required actually drilling and cutting of several heavy steel parts, shattering two cobalt steel drill bits and dulling another. It's a project that sane people, who don't have a very good shop, and that don't have a fabrication welder in the family might attempt. No welding so far, and the word at dinner was that we don't need any welding. We'll see.