Almost all the radios installed in motorhomes are XMSirius ready.
The module with antenna is SXV300v1,
Amazon $35.
The challenge is the install if you want to tackle it. Biggest job is getting the antenna up over the windshield, down the windshield post and across the dash. Pop the radio out find the XMSirius cable, plug it into the SXV300 and the antenna into it. Then follow the instructions for registration to get your free months and pick the subscription package you want.
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Dale & Mark Bruss
13 Years Full-Timing Now with a 2016 Bounder 33C
40' Travel Supreme winter residence
Lots of RV Information at
www.dmbruss.com