Two things work against using this SUV to tow a large (long) trailer - payload and short wheelbase.
You can overcome the wheelbase issue with an excellent WDH and sway control setup. I wouldn't scrimp on this as it will be so important to your safety. Don't be surprised if you need a Hensley Arrow or similar expensive setup (like ~$3500).
The limited payload will be tricky. With only 1400 lbs for everything, you could be cutting it close - count on at least 10% of the total trailer loaded weight as tongue weight - most likely 700 to 900 lbs. I'd definately have it weighed before you buy. You can get a Shurline tongue scale on Amazon for around $100 - it may be money well spent.
If it were me, I'd shop very carefully for the lightest weight trailer that will still accommodate the size of your family. Think hard about how big you really need, as most people end up buying too much trailer.
Good luck!
