The flextail tiny pumps are great, the mark 2 is a far better option (the attachment is much more secure and doesn’t fall off in use) and I use it all the time for backpacking. However for the van I use this one from Amazon. It’s bulkier but does the job much quicker and is cheaper. USB C rechargeable and I get about 5-6 inflate & deflates from a charge.
Better still is a 12V tyre pump with a high volume adaptor but I only carry that when I have the paddle boards.
Review on Amazon: Easy to use and effective
https://www.amazon.co.uk/gp/aw/review/B08TMRH123/R8E0PIIYD5AIE?tag=vwcalifornia-21