You'll need quite a large one. We've got 4 kids, and we put in everything except the tent (which goes in the boot) - so will fill the box with sleeping stuff, cooking stuff, clothes, folding chairs. Works well with the 600 litre box. Last time though I used a trailer....and it was even better as it meant daily access to what is in it is easier.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets