I went to the D4 hitch on my D3. A lot better hitch than D3 and you can remove spare. The D4 has ratchet style lock on pin so that it can not come loose. Have towed 3 ton for at least 80000 km with D4 hitch. Suits my needs as I remove hitch if doing off road work. A lot of D3 hitchs came off because of use of sway bars which should not ever be used as it unloads the hitch allowing D3 one to come off.

