Texas laws on carrying weapons in a car depends the type of car you are driving. You should check the list of cars first. In doing so also check Texas laws on Firearms.

Huh? Only Pickups? WTH are you referring to
So you're telling someone its OK to carry without a permit

Your vehicle yes-On your person inside said vehicle no without a CCL--
Yes, that is EXACTLY what was said. You can carry a concealed handgun ON YOUR PERSON, IN YOUR CAR, with out a CHL.
(See below for further)
Texas Castle law allows you to carry a firearm in your vehicle just as you would in your own house, also no permits needed in Texas besides CHL.
To be clear, NO CHL NEEDED to carry on YOUR property and your car is YOUR PROPERTY!
Texas law makes NO distinction between loaded/unloaded, assembled/disassembled, concealed on your person/concealed in your car. A hand gun is a handgun, period.
The standard for UCW (Unlawfully Carrying a Weapon) is "on or about your person" "About" means within reach. A loaded handgun in a holster on your belt while driving your car is EXACTLY THE SAME as an unloaded handgun in the center console of the same car.
In Texas, the Castle Doctrine was broadened to include your vehicle. You have rights in your home. You have a right to protect yourself, your family and your property. You have the right to possess the means to do so. Your car is still your property and an extension of your home.
You can have a handgun in your car (anywhere in your car) unless you:
Are a member of a criminal street gang (crips and bloods need not apply)
Are not otherwise prohibited from possessing the weapon (convicted Felons need not apply)
Are not violating another law (other than a traffic inifraction).
Gun in holster on your hip, YOUR car or car you are lawfully in, never been to jail, not a gangster, A OK!
As above, driving 80 MPH in a posted 55 MPH zone? A OK!
As above, intoxicated? Go to jail, catch a charge for UCW (in addition to the DWI), have gun confiscated as evidence.
Hopefully that helps to clear things up.