Parkliner has been out of production for several years. There were two versions, the classic single hull 15’er (c. 2012-2018) and the short-lived double hull 16’er during the Liberty Outdoor partnership (c. 2018-2019). Cabin is the same size and layout; the frame was lengthened a bit I think. I may be a little off on the dates, and I’ll count on someone to correct me.
I’m not sure if a 2018 is a 15’ or 16’. One easy way to tell is the entry door: the 16’ has a flat door and the 15’ has a curved door.
IIRC the classic Parkliner came with a macerating toilet that fed into a combined black & grey tank. I think that carried over to the 16’er.
AFAIK the only molded trailer built with a cassette toilet was the
Lil Snoozy. That’s not to be confused with a portable toilet (porta-potty).