Craig, I own a 2006 240da and I tow mine all the time. I just returned from a trip to Bimini, Bahamas. I towed my boat to West Palm Bch, Fla. from Charlotte NC. and back. About 1000 miles round trip. NO ISSUES OR TROUBLES. Anyways that's background info. My boat and trailer(ez- loader aluminum, 7900lb cap.) with 3/4 fuel, 1/2 water and light cruising gear weighs in at 7800lbs. When I loaded it with all the junk I take on an island trip 8900lbs. Right at cap of trailer. I know, I know. These weights were taken at a flying J truck stop scales and INCLUDES THE WEIGHT OF THE TRAILER.
That said the boats weight will be affected by optional equip. you have on the boat. Mine is about optioned out. You have to account for weight from things like the water heater tank, unless you drain it everytime before you tow. The weight represented in the flyers is before options.
I tow with a 99 dodge ram quad cab 2500 w/cummins diesel.
I can tell it's back there and braking performace is affected. (and I have four wheel disc brakes on the trailer!) I can and do tow at 65-75mph on the hwys.
I'm not saying your Range Rover can't tow it, I'm saying you'll be loaded for bear, and make sure you go with a good heavy trailer that has four wheel disc brakes. Mountains and elevation will be your biggest enemy I think. (If you are towing where I think you are.) My trailer is a custom job from EZ-loader. I helped design it the way I wanted it. If your interested in EZ-loader call Jeremy Pack (divison manager) 704-784-4420. The shop is located in Concord NC, but I'm sure there is a dealer near you. Jeremy could spec the trailer for you. Just mention my name Mike Powell, he should remember me. I hasseled him quite a bit to get what I wanted. He's a great guy and very helpful. Don't let a salesman talk you into what I call a town trailer. I don't think they will stand up to 4-5 hours of towing thru the mountains. I'm not pushing EZ-loader, get what you want, I'm just saying get a good trailer. :thumbsup: Good luck!