Out of the available trailer hitch receiver options for your 2005 Buick LeSabre I recommend installing the Draw-Tite Trailer Hitch Receiver # 36309 which is a Class II with a 1-1/4 inch hitch receiver. It does have a Tongue Weight (TW) rating of 300 lbs but you will be limited by the maximum TW rating of your LeSabre. I looked at the online version of your owner's manual and it stated that the max weight capacity of a trailer that your LeSabre can haul is 1,000 lbs and that the TW should... view full answer...