Unless you are talking about one that mounts on the rear axle and goes to the frame. In that case, there is probably no reason not to get one if budget allows. What is the TV? If it's a 1 ton truck you most likely will never see any benefit. If it's a 1/2 ton, then you will see a benefit. I had one installed on my Tundra before I bought it.
2017 28BHBE Kitchen skylight, remote control and Aluminum wheels hitched by ProPride 3P
2012 Jayco Jay Flight 26BH traded in
2013 Toyota Tundra DC 4x4, 5.7, 6 speed 4.30 gears