The spec on the M4800 was 230 feet. The M5000 is 250 feet. They might want to keep the weight down on the 4000. I should point out I am in no way advocating anchoring in a mooring area. It’s very bad form to do so and falls into the category of flying around moored boats towing water toys or running generators at docks. Your swing will be different than moored boats.
G