If I was a trucker and my wallet got sanctioned, then I would just move the bitcoin to a different wallet. 
Or
Use my bitcoin at a merchant for goods and services that accepts bitcoin. These sanctions may be enforced with exchanges but every merchant isn't going to enforce this. 
Or 
Transact with other bitcoiners, eventually the bitcoin would have moved hands so often, is it really sanctioned still?
Its important bitcoin  starts being used to buy and sell services and goods using Lightning and on chain. I think sanctioning is going to be extremely difficult practically.

If they do some how manage to enforce these sanctions globally, then a privacy coin like Monero might be useful. The truckers that had sanctioned wallets could swap bitcoin  for Monero/ privacy coin right? And then either use Monero/privacy coin on an exchange or swap back to Bitcoin. Could use a dex to do the swaps
Swapping back to Bitcoin via a privacy coin will break the trail.
I dont think sanctioning Bitcoin will work. Practically its too difficult to pull off.
They can enforce at exchanges, but else where will be much more difficult.