New dometic fridge needed which one is right?

[Smudgers_81]

Looking for a front fridge that sits between drivers seats somebody recommended this one

https://www.amazon.co.uk/Dometic-CDF-11-Portable-Compressor-Freezer/dp/B003H60Q3A/ref=sr_1_fkmr1_1?keywords=waeco+dometic+compressor+fridge+with+cup+holders&qid=1575231447&s=automotive&sr=1-1-fkmr1

Does the 21 litre fit as it’s bigger and cheaper?

Also any other front fridges as good or better?

Also any idea where I can can buy a decent vw pop top ladder please? Telescopic I’m guessing?