How to get the axle out??

[Nvreloader]

Hey guys
This is a drawing of my rear hub, I need to get the axle out for measurements, so I can get the correct Robert axle for my trailer installment, the OEM axle is a QR type 190mm in length.
I am attempting to figure out HOW.??????
Any suggestions would be greatly appreciated,
Tia

 

[fooferdoggie]

does it have the usual quick release or a through axle? Kinda looks like a through axle so thats usually 12mm or 15mm. a pic would help.

 

[Nvreloader]

Foo
Here is a photo of the rear hub, (Top Hub) 5mm QR type 190mm in length. I have not found any threads, hidden keys, set screws etc, used for removal for the center axle.
Tia