I have done 500 mile days on my Silver Wing I was very sore and tired at the end of the day. I had little time for sight seeing so I looked for things to see on the route I was traveling. I'm assuming you are traveling on the Interstate highway system. You can make good time in west Texas. Good time generally with gas and food stops include you may be averaging 50-55 MPH for calculating freeway distances for a days travel.. It sounds like you are moving very fast. Flagstaff Arizona often has snow. You may think about heading further south along Interstate 10.
