Hi I am looking for some advice on an upcoming trip we have been debating/arguing about for a little while - I think we are kind of in loose agreement but I would appreciate some feedback. Three riders, all experienced and capable of 4-500 mile days if required. All English but two us have lived in the US and Canada so are very familiar, always got around on four-wheels there as opposed to two.
I will outline the plan and would be grateful for some feedback as to whether it is relatively sensible or whether we are biting off more than we can chew.

Plan:
25 days
September 07
All BMW GS's in different flavours
Mostly camping but interspersed with hotels/motels
$200/day each budget for food/fuel/camping etc etc

Basic Route with key locations
Start and finish in Phoenix
Phoenix - San Diego - Palm Springs - Sequoia NP - Yosemite NP - San Francisco - Seattle - Vancouver, BC - Prince George, BC - Fort St. John, BC - Grande Prairie, AB - Jasper NP, AB - Banff NP, AB - Calgary, AB - Glacier NP, MT - Yellowstone NP, WY - Rapid City, SD - Badlands NP, SD - Casper, WY - Salt Lake City, UT - Denver, CO - Albuquerque, NM - Grand Canyon NP - Phoenix. Looking to stay off the Interstates as much as possible.

We are looking to break the trip into three legs Phoenix - Seattle being one, Seattle to Yellowstone bring the second and Yellowstone to Phoenix being the third and allowing 7-8 days for each. Rationale behind this is that we can each take ownership of one segment and do all the planning relevant.

Any comments, observations, suggestions, advice would be greatly appreciated.

Thanks
Mike