FYI, the 2018 Sunseeker 2350LE that I bought last year showed very good winter use results since I checked inside temps along the water lines and under all my cabinets using digital thermometers.
All my water lines as well as the water pump and freshwater holding tank are heated by the furnace.
The raised floor design was able to keep all my cabinets under my sinks heated. Any area that the heat didn't reach (like under the dinette) did not have any water lines.
We're looking forward to extending our season into late fall this coming year.
After taking apart my AF TC apart and putting it back together and digging apart my Lance TC for 8 years, I would say so far, the Sunseeker quality is better than the 2005 AF and about par with 2008 Lance. Maybe its just my particular MH but so far its put together nice and neat. All the water lines and electrical runs are clean and neat.