If you still have your old TV measure the height of the receiver from the ground (level ground) and compare that to the same measurement on the new TV. If the new TV is higher, lower the hitch by that amount. That’ll get you in the ballpark. At the end of the day the TT should pretty much level when hitched and spring bars are engaged.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks