Need center of tire width measurment urgently

[Doc187]

I'm ordering a trailer with etrack in the floor. I need to decide the width spacing of the etrack. The problem is i have tracks on my machine right now not tires and the builder needs to know yesterday. Can somone please give me a measurement from center tire to center tire? I'm coming up with 61" on the tracks but i want it to be good for tires too. I'd really appreciate some help.

 

[Rupp Collector]

58" with stock offset rims

 

[Doc187]

Thanks! You're the man