You have some good choices in the older models. The 190’s have an option of belted seating across the rear sofa giving a total of 4 seats.
Since the seats are all the way in the rear there are drawbacks. The seats are “bouncy.” We are working on improving this with suspension changes but they will always move more than seats further forward.
The A/C and heat from the front may have trouble getting that far back but you do have the option of running the generator and using the heat pump.
Also if you have grandkids back there you can’t hear them hollering but that’s not exactly a drawback.