It's true that some brands have bad distance options. I use the one that's ridiculously far. So far back that I'm never in the stink zone or afraid the automatic brake isn't going to work in time. I'm frustrated when I drive a car without that option.
The problem with putting out the engraved invitation is it means never passing the big trucks. I don't like following directly behind big trucks because of visibility and fumes. But it you leave a big space, people will keep passing you on the right to get into that space, and then you may as well sit in the right lane behind the truck, because you're not going to pass it.