Here in TEXAS, with a CHL license, you are legal to carry OPEN or CONCEALED.
There are some restrictions that dis-allow open carry inside some "posted establishments".
Basic Law here allows you to carry in your car, as it is considered your abode.

I have seen signs on the OUTSIDE of some places that do not allow outside visible carry of a firearm, but do allow concealed.
Always read the signs. They must be posted outside where one can see and read them.