How exciting to be planning a trip like this.. best of luck to you !!
Obviously, you've been given excellent advice.. now it's just going to be a matter of fitting that advice into your travel "style"...
As you can tell.. there are many opinions on how to approach this trip.. guess what, they're all right.. and they're all wrong.. at the end of the day.. it boils down to what kinda travelers you guys are..
I think a helpful bit of information people are still searching for is your time-line.. that will determine everything.. a couple weeks, well, you may NEED to drive 8-10 hours a day.. two months, you can probably drop that down to 6-8 hours a day..
Anyway you slice it.. I'm almost positive you'll have a blast.. I know I can't wait to be at the point in my life I could undertake such a trip.. but for now.. I'm a working stiff who lives as a weekend warrior, with a week long trip added for good measure..
If you're a "planner" type personality, where you NEED to have locked in reservations and time-lines in place.. take advantage of the information on "apps" you can download on your phone.. you can combine that with using Google maps to plot your course..
If you're a "wanderer".. then, the world is your oyster.. keep in mind that the best thing about traveling this way, there are always rest areas, travel centers, Walmarts, Cabelas and truck stops along the way you can pull off and catch a few winks, as you travel down the road.. best of all, those are all free !!
To interject our travel style.. we like to have reservations at our "final" destination, but we "wing-it" along the way.. the one thing I will add is.. because you're traveling so far.. I truly think some days you'll be fine with driving 8-10 hours, while others, you'll be happy to get off the road in 6 hours.. I think as you travel further west in less populated areas, putting some miles behind you will be much easier then when you in suburban and city areas.. so, keep that in mind..
Finally.. a suggest to look into is a program called "Harvest Hosts" (https://harvesthosts.com/
).. it's a way to have alternative places to stay as you travel to and from your destination.. these are typically set up for overnight stays at wineries, farms and other unique locations.. it would mainly be "boondocking" type camping (no hook-up's).. I don't belong (there's a fee), but love the idea of waking up at a winery vs a campground, especially when you're only going to be there for one night as you travel to your destination.. from everything I've read, it sounds like a great program..
Armed with the advice you get here, along with a POSITIVE attitude, this trip will be a piece of cake !!