Tracking LWB 18" wheels

if i recall correctly, I think the toe-in angle is zero.But perhaps someone else should confirm this.

There are some very advanced alignment measuring machines out there, where the wheels are only fitted with a target and then the car is driven/pushed slowly in front of a turret with a laser and it then works out everything. I think the ones where both  the targets and the lasers and clamped to the tyres may not be so accurate.

The steering always rquires some right-hand input when driving on UK roads as the road camber tends to pull to the left.

however, if your steering wheel is actually out of alignmet compared to the direction the wheels are pointing then perhaps the tracking may not be where it should be adjusted.

1. there is splined fit between steering wheel and steering column. Perhaps the steering wheel was removed at some point for access to the instrument binnacle and not put back on straight
2. there are another set of splined connections between the steering column and the collapsible section in the engine bay and again, between that an the steering box.

Any of those would be the best place to alter the set-up.

If you have a newer vehicle, with ESP, you will may need to recalibrate the steering wheel angle sensor, if you alter any of the steering shafts (No. 2, above) or the the track rods. Momentarily disconnect the battery and then after reconnecting the battery start the engine and  turn the steering wheel from lock to lock, when the ESP light should go out.

alignment to the direction of travel

Well, Yes, there is usually a small mark on the end of the steering column spline to indicate straight-ahead, with respect to the indicator mechanism. The steering wheel should be aligned to that; usually its only a matter of +/- one spline tooth.

In fact the track rod only adjusts the amount of toe. The end of the steering rod, from the steering-box arm to the axle swivel-joint arm, is where some adjustment can be made.

Your understanding is correct.

The rear rod connects the left and right wheels together and determines the toe angle. These rods are so massive, that unless you've had a major bump or their ball-joints are worn, they don't normally require adjustment.

The front rod connects either the left (RHD) or right (LHD) wheel to the steering arm of the steering box. You can adjust this one to a small extent to centre the steering wheel. Again, I have never had to adjust this one, which is why i was thinking that if your steering wheel is not straight, either someone has had a previous go at 'tracking' or the other most likely cause is that the steering wheel has been removed for access to the dash, which is quite common.

Picture shows rear, steering rod,

Front steering rod is not shown, but axle-locating rod is shown.

Yes, mine was also LHD from Germany, and pulls a little to the left in the UK, but as I often go over to the continent with it, I decided to leave it alone, as on French motorways, it tracks dead straight.

Picture was just from the internet: search 'G-Wagen axle'

you might like this: http://fourbyfourclub.com/Manuals/W463249Axels.pdf

You've missed one vital step, The steering wheel has to be centred on the column to get the indicators to cancel. but the steering column has to be centred on the steering box so that you have to have the same number of turns of the steering wheel turning left and right

Gordon