I have seen several post about making the outside speakers play with the TV. On my 2017 32DS the inside TV did not play through the radio unless I was playing a DVD otherwise the TV played via the TV speakers. So I put my brain to use and figured out that I could run a long auxiliary speaker cable using a 3.5 mm jack plug, and plug it into the headphone jack on the TV and plug it into the auxiliary input on the back of my Radio. I have a Pioneer radio but most radios will have an auxiliary input jack.
While thinking about this you could run the same cable from the outside TV to the radio and then you could select the appropriate speakers and it will play outside. I purchased a 25' cable for less than $7 from amazon.