The need for an instructor with LR-specific knowledge increases as the training becomes more advanced. Many of the basics are applicable to all vehicles; for example in sand the concept of flotation, how to stop, start, tackling dunes...all that is as relevant to a Patrol as a D3. However...there will be differences. For example, HDC should not be used for sand descents. ESC should be turned off. Sand mode should be selected. Low-profile tyres cannot be aired down as far as high profile. The list goes on. LR instructors know all this but that doesn't mean to say that others don't also know it.
The problem with any instructor teaching any vehicle with which they are not familiar is not when they fail to point out some extra feature, it's when they teach something which is wrong for that vehicle. And it is becoming increasingly hard to keep up with all the different vehicles as you cannot tell what the modern ones do in any given situation till you get there, unlike the days of old when there was no computer to alter the vehicle behaviour according to the conditions.
By the way I would never advocate using HSA and instead teach left foot braking to do hillstarts instead. HSA system have a tendency not to work at inopportune moments. That is HSA as distinct from HDC.
Unfortunately there is almost nothing these days that is universal. There are so many vehicle differences that for almost every technique it is possible to find a vehicle that needs it done differently to the rest.


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I didn't have the opportunity, though, to play with the 4x4s very often. 

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