Memphis and Dallas are 480 miles apart, after Dallas it's back to the shop. Indy for most teams, Michigan for the Kalitta's, N.C. for KB and VC Pro stock teams, Ohio for many of the other PS guys, Georgia for W&K J.
So, if you're going from the shop to Memphis to Dallas to the shop to Richmond to the shop to Las Vegas and then on to Pomona (back to back).
Or the from shop to Richmond to the shop to Memphis to Dallas to the shop to Las Vegas to Pomona What's the difference?
As long as you're going back to the shop on off weeks, it don't matter. Unless you believe that 2x3 isn't the same as 3x2
Alan