Never done it myself, but it's rated at 3500lbs (same as the Rx330 and Rx350). The Rx400h has a LOT of torque and a very well ventilated engine and transmission, so it should be OK. <_< Some/most of the Rx400h's produced also have the towing "prep" package standard (extra cooling i assume). I know mine does, even though there's no tow hitch.