Replacement WD Head for Reese Pro Series 49904 Hitch  

In order to determine the correct roof vent, measure where the vent opens. The standard trailer roof vent opening is roughly 14-1/4" x 14-1/4" and have roof vents that measure 14" x 14". To pick the correct cover, you will also…

In order to use a 2" ball with the Replacement Weight Distribution Bolt-Together Round Bar Head #PS58442 you will need to remove the 2-5/16" ball that comes with it. There are no options without the ball or with a 2" ball. You can…

I do have an alternate solution for you, but unfortunately the Pro Series weight distribution systems were discontinued by Horizon Global (owner of Pro Series and Reese) and we do not have replacement spring bars available for your model 49904. They…

Yes, the Equalizer Shank part #EQ90-02-4700 that you referenced can be used with other brand weight distribution heads. Basically all of the WD system manufacturers decided to use the same dimensions for their heads and shanks so all of the shanks…

The weight distribution head #PS58442 is a direct replacement for #PS49901, #PS49582, and #PS49583. All three have a gross trailer weight of 10,000 pounds. I verified with Pro Series that the head can be used without the spring bars as a ball mount…

After swapping weight distribution shanks you are now noticing more sway than before? Was the trailer not level when you setup the WD system initially with the old shank? If this is the case you'd want to reset up the system and go from there.

Unfortunately the kit they made to replace those has been discontinued and they have no stock of the old parts. You will need to purchase a new head #PS58442 to have a functional part because the clip will no longer hold that bar in place.

The #PS49901 that you have is compatible with virtually all of the weight distribution shanks that are available since most are made to industry standards. The Curt Shank part #C17124 is most likely going to be your best option. From the top of the…

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

An underslung trailer coupler is one that attaches to the bottom of the trailer frame and an overslung one is one that attaches to the top of the frame. The Replacement Head for Blue Ox SwayPro Weight Distribution Systems part #BXW4011 is for…

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.