Upgrading the TV's is a carpentry/cabinetry job for the most part.. See a good cabinet maker
As for the Wi-Fi.. Wi-Fi Ranger is one of the most popular devices, the full system consists of a Router that goes INSIDE your RV, and a "Modem" (Wi-Fi adapter) that goes outside the RV.. You can also do some tricks to increase the "Gain" of the antenna part if you like.. (View early episodes of Amaturlogic.tv for some idea including a Grape Juice can or Coffee can, and a re-purposed Sat TV dish) These improvements are optional and require NO electronics knowledge. Oh, early episodes #3 specifically, and one later, not sure if it's 4,5 or 6
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times