I guess I'll put this here...Just finished a month long road trip, it was pretty great. We just bought a 21 ft toyhauler for the purpose of converting into a mobile grooming salon for my wife to work out of, and also use on our road trips so this was the first trip with the new trailer.
I-95 from CT to DC, spent almost a week there. Then I-70 to Colorado, spent a day in Colorado springs, then I-25 down into New Mexico, then I-40 west to Lake Havasu, AZ where we stayed for about 9 days. The return trip was I-40 all the way to TN, then I-81 North back to DC, and I-95 back up to CT. We averaged about 500 mi/day and that was enough. The Toyhauler was awesome, really glad we made that purchase, and our Grand Cherokee towed it like a champ! No problem maintaining speed at any time, on any hill.
CT, NY, NJ, DE, MD, WV, PA, OH, IN, IL, MO, KS, CO, NM, AZ, TX, OK, AR, TN, and VA all in one trip!
If you haven't driven I-40 through AZ and NM, you need to add it to your driving bucket list. Its some of the most amazing scenery ever.