Good luck with the new rig. My tug is a Navara 2006 STR and I use a Britax mirror on the driver side and the passenger side just one of the type that clip on the existing nmirror. As I recall, the Britax cost about $90 and clamps from the top of the door where the window winds up down to the bottom of the door. It has a rubber pad on the back of the frame where it contacts the door and so far has not appeared to mark the paint work with 4 years of use. The main advantage I find with this is you can take the mirror out without having to take the clamp setup off the door making it legal to drive without the van during stops.
Disadvantage is that it may scratch the widow if you wind it up and down a lot with it on and also, my unit is rusting. I will need to get to it with a wire brush and paint before too long.
To answer some of the other questions about the Navara, it is a great towing vehicle, very economical although my Nav has had D-gas fitted to it to work with the diesel and a 2.75" exhaust which does give it quite a bit more grunt (or economy if you drive passively). My only complaint is that 1st gear is too high and if you have to start on a hill with the van on it struggles a bit. Thank goodness for low range, it will get you to the top of any hill.
If anyone has other queries about Navaras, new or old, D40 or D22, there is a Navara forum where someone can answer virtually any question you can come up with.
http://www.navara.asia/ 