Peter, you are asking a lot, especially there is such a long list of "essentials", anyway, here are some, no doubt others wil add to the list.
Suitably matched tow car.
Hitchlock
Wheelclamp
Caravan Jack
Spare Caravan Wheel and Tyre
Fresh Water Container,Aquaroll or similar
Waste Water Container,Wastemaster, or similar
Gas Bottles
Electric Hook Up Cable for site mains electric.
Bedding
Crockery
Cutlery
Cooking pots and pans
Clothing
Food
First Aid Kit
If you have an awning
Hammer for pegs
The list is endless, almost, but care has to be taken to ensure you do not overload your van.