We've just bought a Nissan Navara crew cab and while the little baby seat fits fine, he's getting too big and ideally we want a 0-4 seat, but still needs to be rear facing. The seatbelts in the back are short, and we're struggling to find a seat that fits. Forward facing is not an option, as he's only 7 months, but 10kg! Any help/recommendations gratefully received!