Agree with all the posts encouraging you to take the Cali.
As stated, the stewards tell you where to position your van. You get an approximate pitch size of 8x6m, but be warned, they do have a tendency to cram them in quite tight (not enough to prevent you driving off site at the end if you leave before your neighbours, but you don't get loads of space around you). May seem even less with the number of tents and awnings that get pitched with vans.
Things to take / do in preparation:
- Levelling chocks. Not had to use mine yet, but bear in mind the field you will be in is a farm 50 weeks of the year - it in not a maintained campsite.
- fully charge your batteries. I've lasted 5 days no problems with fridge on and light use of lights and sockets to charge phones etc. But beware using radio or air con - these will affect main battery. In scorching 28C heat at a festival in Belgium a couple of years ago, batteries only lasted 4 days before fridge turned itself off.
- Fill up water tank before you get there. There are stand pipes, but the queues can be long at peak times.
- take an awning. I have Comfort panels to fit to my wind out awning. The extra space is great for kicking off muddy wellies etc (not that it's going to rain this year though

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- Don't take any glass. (It's a working farm, so it's all to do with what people might leave behind.). That means you need to think about how you transport your favourite tipple. Decant into plastic bottles in advance.
- chill and fill your fridge in advance. Keep it stocked up.
- consider how you might want to keep yourself clean. I'll be taking a solar shower (nothing fancier than a black bag that you leave out in the sun (which will be shining constantly this year). A wash, no matter how restricted is enough to keep you human.
- I don't have a porta-potty (the long drops are ok) but you might want your own facilities.
See you in the West Campervan field in the last week in June!