Splice USB

[frankinbus]

I have a 2016 Seirra 2500 W/T with Two comunition USB ports in armrest center concole ,

Has anyone spliced into them to add one in glove box , I would like to  add a Vais XM inter face system to my existing radio ,

And can i take another shark fin antennas with XM plug and just install in roof 

https://www.vaistech.com/product/gsr-g02-w-tuner-kit/

[frankinbus]

I guess from what i got on this site , it can't be done , the radio head won't recognize two items in one port, Any one can chime in , Has anyone used the VAIS XM radio converson ,