THis may not be possible/applicable but what kind of cell phone do you have? I have an iPhone that allows me to surf the web on its large screen. Having things like Google handy can be a big help.
Also, my Zumo 550 GPS has numerous listings for hotels, motels, campgrounds, etc. Will you be using a GPS?
If you're traveling slab, the rest stops have maps and you'll always find lodging signs that may include "CAMPING"; while it might not always be near to the highway, they are generally a decent distance and you shouldn't be too far from your path.
You can also text message Google - send a txt to 46645 with "Camping near <name of town, STATE>" and you should get some results. If you need a hotel or a retail store for something, it's particularly helpful
You can also use this method to get weather (txt 46645 "Weather <name of town,ST or ZIP>" it will show you the hi/low temps, precip %. NO warnings or advisories typicaly. If you are paying PER message, the Google option might not make you happy; they typically send 2 message replies depending on what you search for. (standard message rates apply, YMMV, blah blah blah)
If you happen to know the ZIP codes it's a little easier to type into the text.
Otherwise, if you have a data plan with your mobile phone service you can use the web browser and look stuff up with greater detail.
ALSO; take/get a copy of the FJR Assistance list if you haven't already thought of that. I would be happy, if you're travelling near me, to help you with locations/numbers of lodging. I'm sure that anyone on the list would be as willing to help in a pinch.
Ride Safe, stay hydrated, take lots of pics and post up a ride report