Here are some photos I took of the Clarktor-6 towing tractor on display at the NMoUSAF in Dayton, OH. The Olympic Flight Museum also has a tractor that appears to be a Clarktor (though I am going to be asking some experts to verify)
More recently, The Clark Equipment Co. produces Clark Airfield Tugs
Clarktor-6 tractor
NMoUSAF 2018
Clarktor Mill 44
Arlington Airport 2018
Clarktor tractor (not sure what model)
Olympic Flight Museum 2016
Olympic Flight Museum 2018
Olympia 2022
Clarktor tractor (not sure what model)
Olympic Flight Museum 2018
I believe this one was just painted overall tan between these two shows
Olympic Flight Museum 2019
Clarktor tractor (not sure what model)
Olympic Flight Museum 2019