You can buy a Fire TV stick right now for $18, you don't have to replace the TV.
That said, we DID replace the TV in our trailer. The original 32" was too far away from the couch and bed to be able to see it, and the HORRIBLE slowness of Furrion TVs when using the controls drove me crazy, so I measured carefully and found that I could fit a 40" in the same space. Problem solved.
I got the TV side piece to be able to use the outside TV mount for the 32", put a Fire TV stick in it I had laying around, and now I don't have my indoor TV outside for viewing.
Rockwood Ultra Light 2304DS, towed by 2018 Ram Cummins Diesel 2500 4x4