Have all wheel drive and four wheel drive pickup new f150. Mud and snow rated tires. Does this truck require chains on all wheels when chain up signs are on. Truck can be switched from two wheel drive to these options. Are chains just needed for the rears?
It would all depend on the signs that you encounter and what they tell you must be done. I know that signs on the road to Mount Washington here on Vancouver Island tell you that you must use winter tread tires AND carry chains, and that ALL vehicles must use chains when the lights are flashing.
I have also seen chains required signs that specify that it only applies to vehicles above a certain GVW and signs that require winter tires or carry chains.
The Ministry of Transportation and Infrastructure has a web page on chain up requirements for BC.