Hi Larabie, I just bought a low km 2014 TDV6 D4. I recon they are the best tow vehicle. The D3 has gone to my son with 230k on it and still in great condition. Routine maintenance by an excellent indie.
I got kind of close to buying a new bi-turbo Everest but really there is no comparison for towing and comfort and I saved more than $15k.
We travel north with 2.8 tons of full height accommodation on the back each year. The D3 did it easy and the D4 should be easier with 8 speeds and the 3.0 litre.
This is my third white Discovery! Do I have a problem?
Peter

