As far as converting from 5th wheel to goose neck it can be done. I know of several and have never seen failures. It is like anything else do it right and inspect often. Other things to consider is how much towing will you be doing. If it was to make a living then buy the right trailer. If it is for recreation just do it. I believe most failures could be attributed to extreme conditions, over loading, poor quality trailer, lack of maintenance. A lot of cracks come from cycling, and harmonic vibrations. If they were unsafe they would be banned from selling. B and W does make nice hitches. That companion is one heavy SOB to take in and out. If you do not care about taking the hitch out then look around for one. Most of the used ones can be had for 5 to 7 hundred bucks. There is some set up required when first installing one. Each will vary depending on your bed floor.