Let's not forget the TPC 46.15 traveling exemption
Sec. 46.15. NONAPPLICABILITY.
(b) Section 46.02 does not apply to a person who:
(2) is traveling;
Remember that 46.02 is what prohibits carrying of handguns by non-license-holders.
Sec. 46.02. UNLAWFUL CARRYING WEAPONS.
(a) A person commits an offense if the person intentionally, knowingly, or recklessly carries on or about his or her person a handgun, illegal knife, or club if the person is not:
(1) on the person's own premises or premises under the person's control; or
(2) inside of or directly en route to a motor vehicle or watercraft that is owned by the person or under the person's control.
I'm no lawyer, but I would think that 46.15 should apply to license holders as well. Why would non-license-holders enjoy a protection and us not enjoy that same protection? I don't know of any court cases that have addressed this, and someone with a little better know-how might come and correct me, though.