Can't enter RHD cars and wheels keep reverting back
My mods has been running fine until recently. Whenever I spawn my modded cars from Simple Trainer, the wheels isn't the same from my last save which is very annoying. And I can't seems to enter most of my JDM cars which are Right Hand Drive
Wheels changing will likely be because you have added a mod that adds wheels. The order will have changed in game, selecting a new wheel.
RHD cars not being enterable is a standard effect of them being rhd. Its often difficult for the game to work out that you are trying to get into the 'passenger' side to drive the car, especially when jacking peds on the street.