As a newby new is really a bad idea. Unless your ready to absorb the huge depreciation of a new trailer, instead buy used.
OK, now for some numbers. Your Armada does not have a real world tow rating close to 8000 pounds. Once you load your family on board you will be lucky to be at 6000 pounds. Even at 6K your tongue weight is going to be north of 700 pounds. With all your family and junk on board how much do you weigh? Between that and its GVWR how much capacity do you have?
As for picking, and being in Riverside find a used Lance.
As for trailers, stick the kids outside in tents would be far smarter.
