Couple things to think about, regarding hitch height. First off, you want the trailer flat and level to measure it. Then, when you're sizing your TV hitch, consider the load you might normally carry, i.e. fill up your cooler and put it in the back of the vehicle, if you have a heavy cooler. This load can cause the TV to change its ride height by an inch or more. Of course another consideration is, will you tow anything else? You might just get an adjustable hitch for the TV.
1995 Toyota 4Runner SR5 4WD 5 spd
2002 Eagle Summit 12