All of this is good advice.
If you have the funds and can spare the weight you might check into an auxiliary tank. Not necessarily for the range, but for the fact that you're not forced to stop for fuel. I have a 40 gallon auxiliary tank and it allows me to only fill up at the end of the day after we have pulled in and set up the toyhauler. We don't have to stop at truck stops, we don't have to worry about blocking anyone, we don't have to worry about being able to get in and out, etc. It is just one less chore to keep track of during the day's travel.
I have about $350 invested and it was worth every penny. It's just a cheap Farm Store tank with a manual fill nozzle, nothing fancy but it does the job.