Corner steadies

I have noticed that if the corner steadies are down my caravan is less susceptible to movement due to wind.

Even if you only put the rear ones down, it's much more stable and only takes a minute.   A van could move in high winds and possibly hit an adjacent one.

Sorry Nav - we must have been typing at the same time.

it's also surprisingly easy to forget you haven't put them down, climb into the van to retrieve something and find the van tipping with a hefty whack.

The clue is in the name really. 

To only use the steadies on diagonally opposite corners will negate the steadying effect and could possibly encourage damage. Using just the rear or all 4 is best. 

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In addition to the above answers, with the steadies down there is no need to use the caravan break which is advisable if the van is not being used for any period of time.  Advisable to chock the wheels as well.

I concur with the above. I always use all 4 when in storage. The point about the hand brake is worthy of note.

Thanks to you all for your informative answers, I have taken all your advice on board.

Yes a very good practice as the brake may stick on also rust forms around the brake shoe were it sits on the brake drum and causes uneven braking