The towing capacity of a 2010 Range Rover Sport is 7,716lbs (3500Kg), WHEN PROPERLY EQUIPPED.
Yours is not properly equipped, if the manual is telling you using a weight distributing hitch is not recommended, and the limit of the hitch is only 550lbs.
Removing weight from the trailer tongue is a BAD idea. Tongue weight equals stability. 10% is the bare minimum, and most conventional travel trailers are BARELY stable at that. A 5997lb trailer with only 550lb of tongue weight is likely to tow poorly. Even if it doesn't tow poorly initially, wind, passing semis/buses, rough road could set them into an unrecoverable sway event. This can happen with any trailer, true, but you are handicapping yourself by making the tongue light, greatly increasing your chance of experiencing trouble.
Try to find a lighter, smaller trailer better suited for your vehicle. Something in the 3500-5000lb GVWR range will be much more pleasant to tow. You will need to compromise on features and space, but you will be camping.
Putting 10-ply tires on half ton trucks since aught-four.