What's the most useful advice?

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What if someone cant afford it. I think there are many caravaners that are enjoying the hobby on a budget. This certainly applied to me in my previous caravaning days with a young Son and a mortgage to pay. 

I would include something on actually walking and looking at the chosen pitch before actually parking on it! Covers both vans and MHs, and particularly grass pitches. Some folks don't have a clue about how soft ground might be, and how to use the gears on their vehicles to best advantage. Unhitching and spinning a caravan on one axle using a motor mover isn't always the wisest option!  Applies to Club Sites, CLs etc.... we have observed a lot of stuck vehicles, badly cut up grass, and ill parked tourers down the years, where a simple look at conditions would have helped.

Check everything twice.

Unless you are a little like me with a slight bit of OCD creeping in.

I know when I checked enough times though as SWMBO ask me if were going or not 

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Once the 'essentials' have been covered ie Wheel nuts/importance of servicing/nose and towing weights etc etc (all have been covered in previous posts) It would be a good idea for a short video entitled 'What to do when you get to a site'' 

Reversing onto the pitch has been covered, levelling, EHU where applicable and a few basic rules:

5 MPH on site

Using facilities (including a video on how to squeegee the shower)

How to use a toilet brush

Not walking across others' pitches

I mention this, because lots of 'members' seem to have forgotten!

"How to use a toilet brush" 

This one especially, How the minority can just leave the cubicle in such a mess beggars belief. And then the Warden has to deal with it 

My suggestion would be a buyer's guide, what to look for when buying a caravan or motorhome. Also, practical tips for towing - speed, nose weight and reversing. 

My thoughts exactly because when you first walk into a dealership you are bombarded with information, and often the salesman is just that...a salesman desperate to make a sale possibly to up his/her commission.

A what to look for guide could save someone £000s with a wrong choice.