I think it would depend on if you're trying to take it slow and enjoy the trip or just get to TX. I would make a general plan and research some options so you can see what kind of availability they have if you do need to roll in at a random hour or without a reservation. Also research a few WalMarts or Cracker Barrel's in the area and make sure they allow overnight parking as a last resort or a quick napping spot.
From my experience most places will have a spot open unless it's some vacation destination or an event is going on, but to play it safe do some research and call some places, so you have options and certain points throughout your trip. For me, reservations make me feel like I'm locked in to making a stop when I have an RV for freedom of stopping whenever we want. Again, it all depends on what you want to do during the trip. If you're trying to camp along the way, find the best stops with things to do and find a campground near there. If you're trying to get through it as fast as possible, have some check points in mind with phone numbers handy and whenever you're ready to stop, just pull in and get some sleep.
I haven't used it yet, but I have the RVParky app on my phone. Good Sam also has a campground directory available. I love state and national parks personally, but there are time restrictions on when you can arrive to some.
Over 1700 miles will take at least 3 days of a lot of driving, so I'd prob pick some hot spots to stay along the way and spend a little time enjoying the area, so I didn't drive myself insane by just staring at the white and yellow lines going by for 3 straight days.
When we drive from FL to MD and back, I researched a few options of places to stop overnight. I found a Walmart in Florence, SC that was a good mid way point for a break. That's a 1000 mile trip (FL to MD) that we do in 2 days with the trailer. Sleep for about 6 hours in the Walmart lot at the midway point and then back on the road to finish the trek.
2010 Chevy Tahoe & 2015 Keystone Bullet Premier 30'