Driving north on the Pacific Coast

[Red Fox]

Traveling from Yuma to Seattle next spring (have April 15 - June 15 to get to Seattle) with our F350 and 38RL Elite Suites. Concerned about highway conditions, grades, and altitudes. Expect to pump up the truck with a Banks tuner/braking systme to be determined while in Mesa this winter. Would love to take 101 up the coast, but everyone says it's too curvy. Others say the grades going into Oregon on I-5 are pretty bad, too. Any advice, experience will be helpful. Then will be traveling from Seattle to Boise in July, so welcome any comments about that route! Thanks!