Since you plan to stream much of your TV programming have you considered what your internet source will be? If you plan to use cellular it is going to eat up a huge amount of data. If you are going to be at RV parks offering free WiFi the service is usually too poor to stream anything or, in many cases, the parks have blocked access to many of these sites due to overloading.
As mentioned earlier, 55" TV in the bedroom is going to need a great deal of support but it may also be too big as you will not be very far away from the TV while laying in bed. Be sure you size the TV to the need and the distance from which you will be watching.