D4 Door mirrors

[mikel]

Following a recent Sydney Perth trip using small mirror mounted towing mirrors I am keen to know if there is any way to increase the spring tension in the "knock back" system.
The reason is on several occasions while passing oncoming semi's / B doubles etc the drivers mirror was knocked back by the trucks air pressure wave. This only happened when the truck was close to the white line and / or speeding. We were towing a 15'6'' full height van and doing 90 / 100k's and had no other issues with the mirrors.

The trip proved to us just what a great vehicle the D4(2.7) is and had no problems towing the 2t dual axle van 4770k's to Perth. We spent up to 10hrs on the road most days and felt ok at days end with no aches or pains. I will be flying back after Xmas to do the return trip and don't want the drivers mirror trying to come in through the window (it tends to get your attention very quickly).

Any advice would be gratefully appreciated before I go and buy new / bigger / more complicated towing mirrors.

[kero]

I just use a bungy cord , hook onto mirror and hook under lip of the front guard.

[Mudrunner]

I can only assume that by adding smaller mirrors to your existing mirrors you are essentially creating a leaver effect on the mirror mechanism. i.e making the "knock back" mechanism move easier than it normally would by increased surface area/wind resistance appled to the factory mirrors. Those B-Doubles certainly pack a punch, I had a windscreen replaced prior to an 8K round trip of NSW, QLD, NT, SA, Vic. Battling a fierce head wind near Coober Pedy a B-Double passed disslodging my passenger side plastic pillar moulding.
Difficult situation, bonnet design on the Disco's don't allow for those wheel arch mounted mirrors which would solve your issue.
Shane.

[Lobster]

I noticed recently on a D3 with a caravan, the owner had used rubber door stop wedges to prevent the mirrors pivoting when trucks passed by.

They were wedged into the gap between the mirror and the door frame.

Unfortunately I didn't have a close look, there could have been 2 per side as the gap is fairly wide.

The wedges were similar to these but possibly thicker :confused:: Window and Door Wedges (http://www.clarkrubber.com.au/window-and-door-wedges.html)