I’ve been looking at vehicles to transport camping gear, 2 bikes, pushchair, 2 adults and 2 kids.
VW Transporter looks to be the best bet, might be able to squeeze it into a Mitsubishi L200 double cab.
Anyways, while looking at vehicals boot space on Google Images. Came across the Honda pilot which is sold in America, might be worth emailing ahead to see of you can rent one..boot is huge.
There’s also the Ford explorer which is a 7 seater, rear 2 seats fold flat giving a huge boot.