We have been towing a 6 x 10 foot utility trailer for years with first our '89 Rover, and then our "94. We had the trailer loaded up with our booth to do trade shows and it is quite heavy, and the Rover we felt was a very solid towing vehicle.
We also have just gotten a "90 short wheel base Rover. The engine is only a 3.9 (I think) V8 as opposed to a 4.2 V8 in the '94. The towing capacity is 1000 lbs less than the 94, at 5500, our trailer is 4500 dry. But the '90 doesn't have air suspension.
Even thou it doesn't the manuel STILL says a weight equalizing hitch should not be used with a Range Rover.
One reason we are considering using the '90 and beefing it up to be our tow vehicle, is just to keep the other car from having the wear and tear, and maybe ruining its air suspension.
Anton, I am not sure about the switching the the sway bars, we are not there yet. But our feeling is if you go slow and use a lower gear maybe you will be able to move your 31' (make sure you have the electric brakes connected thou!).
Most of our towing will be about an hour from our house, to the beach. That's why we are bent on using one of our Rovers. For longer distance, we also have a
26' that is much lighter weight and we plan to gut it and make it an open space basically with just a bathroom and an airbed.
I think you will be fine with your flying cloud. We have been considering the Hensley hitch that Leipper recommends.
Which Rover should we choose?