You have a JS3 Super LP. The I-beam front axle was optional in place of the adjustable wide front axle. There were no Industrial LP built so I think someone swapped out the rear rims and centers for those from an MM Industrial. The JS3 could be optioned out many different ways to suit the farmer's needs including tricycle narrow fronts and single front wheels too. Please post the serial number and we may be able to shed more light on your tractor.