What I mean is the Aircraft has it's cargo door on the right side, not the left like most others.
Well...no, maybe you mean the opposite: the ER145 has a cargo door on the LEFT, while most of other airplanes have it on the RIGHT.
That airplane in the GSX internal database has been configured to have NO cargo door at all, for the reason I already explained, we don't even have a loader capable of going that low.
That explains why you said, initially, there was no loader, which is normal and correct.
In your following message, you said you *have* a loader now, but it's going to the right, which seems to indicate you modified the airplane configuration that comes with GSX.
In order to have a loader going to the right side of the fuselage, there's nothing special to do: just place the door with the airplane configuration editor, but be sure the *green* arrow is pointing to OUTSIDE of the airplane.