My wife complained about not having Sirius in her van and can't listen to the same stations we listen to in the truck.
For Christmas I got her a XMSirius bundle with a small radio which she can use in the van, and a larger 'dock' unit with speakers to use outdoors and in the TT.
The dock unit can run on 12V/ 120AC/ or C cell batteries.
Check the Sirius web site, and major retailers like Amazon.
I've looked at internet radio - it's not really an option for us because we camp in remote places without cell phone/ internet access often.
And I don't have a grandfathered no bandwidth limit cell plan.