We average about 500-600 miles a day when towing our TT. We travel with two kids and my 60+ year old mom. Fuel stops take about 20 to 30 minutes to get pulled in, fuel up, and use the services. Then there are always some unwanted stops for the bathroom services in between. We use the TT for this, but it still means pulling over somwhere. TT tires are rated for 65 and the heat that time of year can cause problems if traveling at 80 or 85 mph, despite the speed limit allowing it. I found it is slower just manuvering with the trailer on the road and in the parking lot for fuel. I would plan three and a half days travel for us to do that trip. If I were pressed for time, I would throw a camper or shell on or tent in and be able to drive at the maximum speed allowable. Whatever you choose, I hope you have a great time. Both places are awesome.