Are you going to Yosemite too?
If so, you could see Yosemite first and travel over Tioga Pass. We have been over Tioga 4 times in the MH. Coming from the west, the driving is OK.
Here is a description of HYW 155 from the Mountain Directory. 23 miles from the top of the summit to Wofford Heights (Lake Isabella area). The descent starts with 9-10%, then 6-8%, one mile of 13%
and 5 miles of 11%.....then a stop sign
Of course you would be going the other way. Hugh is correct. Even in a car it is a work out.
Have fun and enjoy Sequoia. Be sure to hike Morro Rock if you are able. Kings Canyon is pretty too, but that is another grade
Do you have a place to stay near Sequoia?