SQUARE TUBE VS ROUND TUBE

What is most commonly known between these two trailer hitches is that the square tube hitch has a small structural advantage of 100lbs TW (Tongue Weight) and 1000lb GTW (Gross Trailer Weight).  However, this is not true with all hitches, there are several that have the same tow ratings. 

Round tube hitches are mainly chosen for their attractive design, but are commonly known as being more visible under the vehicle. It is best to check the trailer hitch's installation instructions and features. Most times the installation will advise wether or not the trailer hitch will be more visible under the vehicle, in some cases, the square tube is more visible.

Another advantage of the round tube over the square tube receiver hitch is added clearance between exhaust, bumpers, and cross members attached to your frame.  This is because the round trailer hitch can bend in more directions where the square tube can only be bent front to rear or top to bottom.