Even though stationed overseas, I keep up on Kansas' 2A laws (I grew up and lived in Olathe for over 20 years). The State Preemption is active. So, there is a minimum, that can be adhered to without any trouble. Some areas of KS allow open carry, most metro areas don't. All of the KC Metro area does not allow open carry. However, with the preemption law, you can legally carry in your car as long as you adhere to some minor guidelines:
1) the handgun must be unloaded
2) the gun must be in a container (nothing of the gun showing; fanny packs and holsters don't count)--a good example would be the plastic (lockable) gun case that comes from the factory with most new guns.
When I carry in KS, I drop the mag, clear the chamber and lock the slide back. I then put the (loaded) mag and the handgun in the case. I leave it right beside me in my vehicle. If the $h*t hits the fan, then I load the mag and hit the slide release. The law isn't CCW, but at least I can leave the gun in an almost ready condition nearby.
If at all worried, then you could fall back to the Federal standards for peaceable journey.