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What is the Difference Between Trailer Weight Distribution System Round Bars and Trunnion Bars

Question:

I have a 2004 Chevy Tahoe and looking at purchasing Keystone travel trailer total lenght 35, with Wide Stance Axles. TW is 780lbs. What is the difference between the WD w/ Sway Control Code # RP66074 and RP66078.

asked by: Mike T


Expert Reply:

The Strait-Line Weight Distribution Systems # RP66074 and # RP66078 are very similar. The difference is the type of spring bars that each kit uses. The RP66074 kit uses trunnion style bars. Trunnion bars slide into the weight distribution head from the side or back. They are considered more heavy duty and can handle trailers of greater weight than round bars.

The RP66078 kit uses round bars. The round spring bars slide up into the weight distribution head and are held in place with little clips. Round bars work great for most applications. But when trailers start to get heavier with a high tongue weight approaching 1,500 pounds, trunnion bars would be a better option.

The bars in each kit feature the cam end which is used by the dual-cam sway control. Dual-cam sway control is a proactive system that stops trailer sway before it starts. Both systems have the same tongue weight capacity rating, 600 to 1,200 pounds, and the same gross trailer weight capacity, 12,000 pounds.

Neither of these systems comes with the required adjustable shank (# RP54970). But you can get them with the shank included. For the trunnion bar system with shank you would need part # RP66084. For the round bar system with shank you would need # RP66088. Then all you would need is a properly sized ball such as # 19286 (2-5/16 inch diameter) or # A-90 (2 inch diameter).

I have included a link to the installation details for Weight Distribution and Sway Control # RP66088, which is the system that I would go with. I have also included a link to our weight distribution and sway control FAQ article for reference.

expert reply by: Michael H




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Products Referenced in This Question

Hitch Ball with 2-5/16" Diameter and Medium Shank, 12,000 lbs GTW - Chrome


Hitch Ball with 2-5/16" Diameter and Medium Shank, 12,000 lbs GTW - Chrome

ratingratingratingratingrating
66 reviews

19286

Retail: $17.13

Price:  $9.99

Product Summary:

Hitch Ball
Standard Ball
12000 lbs GTW
Class IV
Chrome

Product Specs:

2-3/4 Inch Shank Length
2-5/16 Inch Diameter Ball
1-1/4 Inch Diameter Shank


more information        




Hitch Ball with 2" Diameter and Medium Shank, 10,000 lbs GTW - Chrome


Hitch Ball with 2" Diameter and Medium Shank, 10,000 lbs GTW - Chrome

ratingratingratingratingrating
98 reviews

A-90

Retail: $18.20

Price:  $11.99

Product Summary:

Hitch Ball
Standard Ball
10000 lbs GTW
Class IV
Chrome

Product Specs:

2-5/8 Inch Shank Length
2 Inch Diameter Ball
1-1/4 Inch Diameter Shank


more information        




Reese Weight Dist Shank - 12-1/4" Long - 2" Drop to 6-1/2" Rise - 1,500 lbs TW


Reese Weight Dist Shank - 12-1/4" Long - 2" Drop to 6-1/2" Rise - 1,500 lbs TW

ratingratingratingratingrating
24 reviews

RP54970

Retail: $132.56

Price:  $89.95

Product Summary:

Weight Distribution
Accessories
Replacement Parts
Trunnion - 6-1/2 In Rise
Round - 5-1/4 In Rise
1500 lbs TW

Product Specs:

Trunnion - 1-1/4 In Drop
Round - 2 In Drop
Shanks
Fits 2 Inch Hitch


more information        




Strait-Line Weight Distribution w Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs TW


Strait-Line Weight Distribution w Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs TW

ratingratingratingratingrating
24 reviews

RP66074

Retail: $842.96

Price:  $476.06

Product Summary:

WD With Sway Control
Prevents Sway
700 lbs
800 lbs
900 lbs
1000 lbs
1100 lbs
Up to 12000 lbs GTW
Shank Not Included

Product Specs:

Fits 2 Inch Hitch
Fits 2-1/2 Inch Hitch
Electric Brake Compatible
Allows Backing Up


more information        




Strait-Line Weight Distribution System w Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs TW


Strait-Line Weight Distribution System w Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs TW

ratingratingratingratingrating
24 reviews

RP66084

Retail: $1,001.77

Price:  $540.45

Product Summary:

WD With Sway Control
Prevents Sway
700 lbs
800 lbs
900 lbs
1000 lbs
1100 lbs
Up to 12000 lbs GTW
Includes Shank

Product Specs:

Fits 2 Inch Hitch
Electric Brake Compatible
Allows Backing Up


more information        




Strait-Line Weight Distribution System w Sway Control - Round Bar - 12,000 lbs GTW, 1,200 lbs TW


Strait-Line Weight Distribution System w Sway Control - Round Bar - 12,000 lbs GTW, 1,200 lbs TW

ratingratingratingratingrating
24 reviews

RP66088

Retail: $929.22

Price:  $579.95

Product Summary:

WD With Sway Control
Prevents Sway
700 lbs
800 lbs
900 lbs
1000 lbs
1100 lbs
Up to 12000 lbs GTW
Includes Shank

Product Specs:

Fits 2 Inch Hitch
Electric Brake Compatible
Allows Backing Up


more information        





Product Page this Question was Asked From

Strait-Line Weight Distribution w Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs TW


Strait-Line Weight Distribution w Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs TW

ratingratingratingratingrating
24 reviews

RP66074

Retail: $842.96

Price:  $476.06

Product Summary:

WD With Sway Control
Prevents Sway
700 lbs
800 lbs
900 lbs
1000 lbs
1100 lbs
Up to 12000 lbs GTW
Shank Not Included

Product Specs:

Fits 2 Inch Hitch
Fits 2-1/2 Inch Hitch
Electric Brake Compatible
Allows Backing Up


more information        







More Answers about Weight Distribution





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