Oklahoma City to Chicago - best route for motorhome? Tolls??

I-44 in OK is good straight highway with 75 mph speed limit. The toll won't be that much, as tatest pointed out. If you are in no hurry, you can instead take old route 66 (mostly 2 lane) through such towns as Arcadia, Stroud, Bristow, Sapulpa, Catoosa, Claremore, Chelsea, and Vinita. Good pavement but it will probably add an hour or more to your drive.

With any other route, the gas will eat up your toll savings anyway.