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The Center Line system overcomes many problems associated with the equalizing hitches and passive friction sway controls that have been in use for the past 30 years:
- No more removing the sway control when backing up! The Center Line system is deisgned for your convenience.
- No more waiting for the trailer to right itself as passing trucks, wind or road conditions cause sway. The Center Line system is self-centering.
- You don't have to hear our system to know it's working. The Center Line system's advanced technology significantly reduces noise common with old technology systems.

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Center Line Head Assembly Kit
Includes head assembly, spring bar brackets, 10" shank and hardware kit. Spring bars not included, required to complete hitch (see below).
| Tongue Weight Range |
Gross Trailer Weight |
Part # |
| 500 - 1,400 lbs. |
4,000 - 14,000 lbs. |
31390 |
Center Line Spring Bars Only
Match the spring bar rating to the trailer weight. Spring Bars have metallic gray textured finish. Sold in pairs.
| Tongue Weight Range |
Gross Trailer Weight |
Part # |
| 500 - 1,400 lbs. |
4,000 - 14,000 lbs. |
31511 |
| 801 - 1,200 lbs. |
up to 12,000 lbs. |
31512 |
| 1,001 - 1,400 lbs. |
Up to 14,000 lbs. |
31513 |
Center Line Shanks
| Shank Length |
Shank Rise |
Shank Drop |
Part # |
| 10" Forged |
7-1/2" |
1/2" |
31552 |
| 12" |
7-1/2" |
1/2" |
30855 |
| 14" |
7-1/2" |
1/2" |
30856 |
| 10" |
10-3/4" |
3-3/4" |
30857 |
| 14" |
10-3/4" |
3-3/4" |
30858 |
| 12" |
13-1/4" |
8-1/4" |
30859 |
| SAFETY TIP: Do not use the Center Line Hitch with loaded trailers under 4,000 lbs. |
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