Jason, these guys are mostly concentrating on getting from right to left coast in as short a time as possible. That's the absolutely wrongest way you could possibly go about it, imo.
Back in the days when we were seasonal FS employees w/o benefits nor job security, my wife and I made several cross country round trips by car, Oregon to Florida and back. I've done it taking 5 months, 4 months, and 6 weeks.
Take my word for it, 6 weeks was by far the least enjoyable, because it forced a pace that was too hurried.
But then, I'm a strange bird in many ways...if there was a way to avoid the interstate route, we'd usually take it. If we saw an interesting natural feature or little town, we'd stop and spend a day or three. We camped almost exclusively, which takes more time in getting to and from a good place to do so, and in basic logistics.
Now I know you can't take months to do this, but take as much time as you possibly can. There is more to see and enjoy in this country than you could ever accomplish in several lifetimes...take your time.