We are planning a trip from Vancouver BC to Las Vegas mid September, and want to try a new route. In past we have taken (A) I-5 to Bakersfield and across to Vegas (B) I-5 to Sacramento and across to 395 south to 15 and across to Vegas and (C) I-5 to Mount Shasta 89 to 385 through Reno to Vegas.
This time we are planning to go I-5 to Seattle,I-90 to 82 join 84 to Salt Lake City then I-15 to Vegas.
We are pulling a trailer and would like to know how long and severe the mountain climbs are in Washington and Oregon on this route. How do they compare to Siskiyou.