No gas in Mineral. There is fuel in Chester and Westwood.
Steady grade Red Bluff to Mineral. A few sharp curves from Lassen Lodge to Mineral. Curves climbing the pass east of Mineral, then flat and straight all the way to ~5 miles east of Westwood. Minor curves over Fredonyer Pass to Susanville. One sharp curve just entering Susanville.
Easiest fuel in Susanville for a big rig is almost through town, on the left, right where Main Street makes a gentle curve to the right (Spirit Station). There is a casino in town with cheaper gas but is off Main Street and hard to find if you do not know the streets. There is a way to bypass Main Street traffic. PM me if you want instructions. From Susanville to Reno the highway is flat and straight, good road. Can be windy at times.
Large turnout with a restroom at the top of Morgan Summit east of Mineral (snowmobile park). Another snowmobile park just west of Fredonyer Summit for another break.
Chester is a full service town with all the amenities.