We pulled a 2007 Airstream Bambi (19 ft) CCD Series with a 2012 4Runner with 6 cyl. Hitch weight 510lbs GVWR 4500lbs We had sway control but no weight distribution.
If you check I think you will find that your TV is not to be used with weight Distribution. You can change out the receiver for one made for a Lexus and with that one you can use WD.
Not a bad combination. With the short wheel base choose a shorter trailer to keep sway under control. We towed mostly in the south and in the Smoky Mt area. Just hold your added weight down and drive 60MPH or less and you should be OK.