If the above post is an a or b or c kind of scenario, then it would seem to me that I can open carry based on the fact that I'm allowed to do so in Wisconsin, as well as I own the firearm that I carry, plus I'm only there for the weekend (less than 180 days).
The key word is "all". You must follow (a) and (b) also.
"28.422 ...
(8) An individual who is not a resident of this state is not required to obtain a license under this section if
all of the following conditions apply:
(a) The individual is licensed in his or her state of residence to purchase, carry, or transport a pistol.
(b) The individual is in possession of the license described in subdivision (a).
(c) The individual is the owner of the pistol he or she possesses, carries, or transports."
I cannot speak for Indiana, but it's my understanding that in Illinois I can carry my weapon in the same fashion as I do in Wisconsin.....as long as I don't leave my vehicle (must be in plain sight).
You are good to conceal in your vehicle through Ill.
Ill law:
"HB183 Section 40.
(e) Nothing in this Act shall prohibit a non-resident from
transporting a
concealed firearm within his or her vehicle in
Illinois, if the
concealed firearm remains within his or her
vehicle and the non-resident:
(1) is not prohibited from owning or possessing a
firearm under federal law;
(2) is
eligible to carry a firearm in public under the
laws of his or her state or territory of residence; and
(3) is not in possession of a license under this Act.
If the non-resident leaves his or her vehicle unattended,
he or she shall store the firearm within a locked vehicle or
locked container within the vehicle in accordance with
subsection (b) of Section 65 of this Act."
Again sorry get that Wisconsin CCL