Serial number isn't going to help us much, I doubt that Sylvan would be much help either.
Photos are good.
HIN from the registration papers, and or title would help.
Model of boat should also be on the USCoastGuard capacity and rating placard, found somewhere within sight of the drivers seat.
Also, trailer manufacturers tend to be regional.
What types of launches will you use?
Gravel?
Concrete?
Beach?
Freshwater or saltwater?
How deep/shallow are the launches?
Sylvan, Smoker Craft, and Starcraft boats all come from the same factory, and share their hulls.
There is a very active forum page for Starcrafts, frequented by many knowledgeable members.
http://forums.iboats.com/forum/owners-groups-by-manufacturer/s/starcraft-boats
