Diane and I recently hauled our 500th load, giving us a reasonably-good size set of data to work with. In about four years, we have team driven straight trucks (D, DR and CR units) for FedEx Custom Critical and have been White Glove qualified the entire time.
I mention this because different carriers haul different kinds of freight. Even within the same carrier, you will see different kinds of freight than other drivers, depending on your credentials and desires.
I know some drivers that never go out west and others that are happy to go. Naturally, those that refuse loads west of the Mississippi will have that reflected in their run data.
The White Glove distinction is important too. White Glove drivers are eligible to haul loads non-White Glove drivers seldom see. That increased load eligibility makes it easier to get out of a western state, or get moving in one. What might be a dead area for some can be more active for others.
Panther has a division that competes for White Glove-type business. I do not know enough about Panther's western operations to say anything about it. Perhaps others who are better informed about Panther can.
So, when considering the following, also consider that our results are those of team drivers with certain credentials, that like going to and running in western states.
Of 500 loads completed:
42 picked up in California
05 picked up in Oregon
06 picked up in Washington
01 picked up in Idaho
11 picked up in Nevada
09 picked up in Arizona
In other words, 74 of 500 loads, or 14.8% picked up in Pacific-coast states or the next states inland. The majority of California freight originated in the Los Angeles area.
Nationwide, our top three states for freight pickups are:
California, 42
Pennsylvania, 32
New Jersey, 25
Based on 500 loads, we have come to believe that if we are anywhere along the I-80 corridor between Chicago and New York City; or anywhere along the I-95 corridor between Boston and Richmond, Virginia; or near Los Angeles, we are sitting pretty for our next load.
That is data and observations from one team. Hope this helps.
Regarding your question about working the west or east coasts, the more willing you are to go to where the freight is, the more successful you will likely be.