A good resource to check for what can be flat towed are the Motorhome guides that can be downloaded for free
http://www.motorhome.com/download-dinghy-guides/
As far as I can see there is not any Kia that can be flat towed, so your only option is a tow dolly. You need one that can accommodate the width of your Kia's front tires and should opt for one that allows that platform to swivel when you turn. You need a brake controller in your RV.
I previously used a Roadmaster tow dolly to pull my wife's Nissan Cube until this year when I finally got tired of paying to store that dolly, the hassle of hooking it up and cinching down the tires of the Cube and the headache of where I would put the dolly in the campsite. That said, I think that after paying for a tow bar, baseplate installation, braking system, and dinghy wiring it costs more to flat tow than to use a dolly, putting aside the cost of buying a flat towable vehicle.
Further thoughts: I felt that the brakes in my dolly were more effective than the RVI braking system used in my dinghy. Although it is not easy to back up with a dolly it is technically possible if you are well skilled, which I would never try with my tow bar for fear of damaging my crossbar.
That said I am glad to be able to flat tow for the ease of hook up and disconnect.
