I don't have a park model, but use my trailer like one as I am seasonal. In my opinion, a park model is to a cottage, what a double-wide is to a house. And I don't have a problem with that. I can't afford a cottage on a waterfront property. I can afford a trailer and rent a seasonal waterfront lot. It becomes a cheap cottage.
We have permanent hookups, but still have the holding tank, so I still need to use it like a regular RV with the black tank closed and only open it to dump.
There are a lot of park models where I am setup, I'd say about half of them if not more have holding tanks. I don't really understand why. They also even have a battery, water pump, fresh water tank and lights on 12V. I guess they can be setup on a vacant lot and just use a generator, lug water and a blue tote for dumping.
Anyway, the problem with home style toilet is just the amount of water. If you always have full hookup, it's not an issue other than having to dump more frequently. I'd go with a nicer ceramic RV model myself.