Hey folks, there are several different mounting systems for wheel liners and simulators. The OP is going to have to determine which style he has before he can properly remove them. Some unscrew, some pull off. Some have 2 nuts and some have 3 probably there are some with even more. A few may even be left handed threads.
Some are mounted using a rubber hammer just like cars used to be. There are probably other methods too. I don't think any of us can say exactly what method is used to mount the OP's liners/simulators.
When seconds count, the police are only minutes away.
2019 Newmar Canyon Star 3627 on a 2018 F-53 26K chassis w/6 speed transmission
2017 Jeep Wrangler JKU with Ready Brute tow system
Nashville, TN or Titusville, FL when not on the road