Yup, almost every Keystone fifth wheel and travel trailer model in the "select" and up (and some of the "standard" models as well) have porcelain toilet bowls. If you consider that a plastic toilet is about 60% of the cost of a porcelain toilet and weighs about half as much, when you "design, engineer and weight balance" a trailer, if "light weight, cost and profits are a consideration, the cheaper models and the lighter models will have light weight components. That means plastic toilets and plastic sinks. It's extremely difficult to build a 33'3" travel trailer that weighs 5500 pounds without cutting out the weight of porcelain. That's just a part of the "cost of weight reduction"...
Our 2011 Springdale 242 fifth wheel had a porcelain toilet, but it wasn't considered an "ultralight" model.
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS