I've done a lot of hitchin' in my day. So I'm going to give you a different piece of info.
Best way to do pond distant hitches are to use truckers, best way to get a ride from a trucker is from a truck stop
Go into a truck stop early 4amish get some coffee. Talk a lot with your waitress and let her know y'all are trying to find a ride. They are key to this
Once you find the guy ( and traveling in pairs you might need to split up ) be cool and conversational.if he isn't going all the way and he thinks your a all right guy, he will most likely get on the cb and get your connection ride.
Always keep a knife hidden on your right hand side, just cause. With a lanyard for quick use if need be.
I have made it from Cali to FL. In 3days this way. So this should let you blow right threw the deserts and find some trees
Be cool, and keep your guard up
Hope this helps, and y'all have a great trip