You didn't list what radio you have, and not all trailers have the same one.
But very likely you will have buttons on the front labeled "A" and "B".
A is likely your inside speakers and B the outside ones.
When you push the button (either A or B) it will shut off that zone.
Push the button again, and that zone turns back on.
So, yes you can shut off the outside speakers when you don't want them on.
Note: The buttons might be labeled Zone 1 and 2 instead of A and B
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2022 Cougar Half Ton 24RDS
2019 GMC 2500HD (gas)
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