Small tank volume – For safety reasons?

Hi, when I look at the tank volume of today’s cars, I always have the impression that a number bigger could not hurt anything. As a frequent driver, I always find it extremely annoying to have to fill my 70-litre diesel tank twice a week, not to mention the holiday trip, where the part of the trailer crew is already as good as empty after 600 km. A 150-litre tank instead of the above volume represents in principle no greater safety risk, because one can use modern tanks with the This is very laudable, but as a special accessory, the buyer should at least have the possibility to order a larger tank while at the same time not having a bit of trunk volume. What do you have to say about this problem?