If you mean 5th Gear = Drive, then the answer is NO, assuming we are talking Automatic.
When ever your towing with an Auto Box, you must use Top Gear only, never Overdrive or "D"
Reason is the gear box over heats. Found this out when towing caravan around Australia, the down side is you use more fuel, the good side is you get to keep your gearbox in one piece.
From the 1993 Land Cruiser owner's manual: without towing package - 3500 lb.; with towing package - 5000 lb.
6,500 lbs.
The maximum tosing capacity of the 2011 Toyota Land-Cruiser is 8200 lbs..
The maximum tosing capacity of the 2007 Toyota Land-Cruiser is 6500 lbs..
The maximum tosing capacity of the 2003 Toyota Land-Cruiser is 6500 lbs..
The maximum tosing capacity of the 2010 Toyota Land-Cruiser is 8500 lbs..
The maximum tosing capacity of the 2013 Toyota Land-Cruiser is 8500 lbs..
The maximum tosing capacity of the 2008 Toyota Land-Cruiser is 8500 lbs..
The maximum tosing capacity of the 2009 Toyota Land-Cruiser is 8500 lbs..
The maximum tosing capacity of the 2002 Toyota Land-Cruiser is 6500 lbs..
The maximum tosing capacity of the 2014 Toyota Land-Cruiser is 8200 lbs..
The maximum tosing capacity of the 2006 Toyota Land-Cruiser is 6500 lbs..