Stopping in St. George, UT and Rifle, CO- restaurants?
Have you ever been to Rifle? there wasn't much there. why not make the extra haul to Glenwood Springs? you can detour to Balsalt or even Aspen if you have the time.
are you planning on driving from LA to St George? that's a good 6-7 hrs which sounds reasonable. you can then drive from there to Denver which is a very long drive. maybe 10-11 hrs without traffic. you can drive to glen wood springs which is another 7 hrs or so from St George. anyway...