Axxera actually makes one now that has the nav and Sirius in it. Look on Crutchfields website. Looking at the pictures it looks like it may even use the same wiring plugs as the others, so you wouldn't have to cut and splice all the wires.
We already have the 7" rv Garmin and the onyx mounted in our Chateau or I would buy one myself. I really don't care for all the stuff on my dash either.
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