Welcome! We have a 2015 351, and our sleeper sofa has 2 seat belts.
We can transport 6 people with seat belts - 2 in the dinette, 2 on the sofa and 2 in the front. Some coaches also have a 7th seatbelt in the chair behind the front passenger seat. If it has the Euro chair, it does not have seatbelts, but the barrel chair does. but you can move the euro chair after you park, and you can't move the barrel chair.
You may want to post any more questions in the Georgetown forum, more people may see them!
2015 Georgetown 351DS
Chris, Garren (humans)
Edgar & Carlos (felines)
RIP Sophie, the sweetest cat ever.