1 pair only....
RWD chains go on rear
AWD...chains go on rear
going to BB...go half way up to where they require you to put chains on...PAY THE GUYS $10-20! it's worth it..they do it in like 5 minutes....it will take you 30 minutes!
Also, check road restrictions:
NORTHERN CALIFORNIA CHAIN CONTROL REQUIREMENT LEVELS
W: No Restrictions – Watch for snow on pavement.
R-1M: Chains are required on single drive axle vehicles with trailers. (Commonly referred to as R1 Modified)
R-1: Chains are required on all commercial vehicles (trucks or buses). All other vehicles (cars, pickups, vans, etc.) must have either snow tread tires or chains on the drive axle.
R-2: Chains are required on all vehicles except four-wheel drives with snow tread tires on all four wheels, provided tire chains for at least one set of drive wheels are carried in the vehicle.
R-3: Chains required – ALL VEHICLES – no exceptions.
R-1 and R-2 are the most common chain controls. The highway will often be closed before an R-3 control
is imposed.