The oem hitch on the D4 is much improved over the D3.
This means you should only have to buy the tongue insert & ball.
Believe it or not I found the oem insert to be cheaper than a 3500 kg rated one from hayman reece!!!
I have retro fitted a D4 hitch & insert/tongue for my D3.
I am not sure which is the best brake system however be aware that if they are not wired right they can be problematic.
Regards
Chuck


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