We’re all trying to avoid a saggy rear end, so I finally installed the Hellwig 61902 Pro-Series Helper Springs with Silent Feature.
These were straight forward to install without raising the truck or removing the wheels.
The installation took me about 90 minutes but would have been far less with the proper tool – namely an appropriate socket for my torque wrench. Instead I was forced to tighten all the screws using an adjustable wrench because I couldn’t invest the 20 minutes driving to AutoZone. Brilliant.
I simply followed the instructions and installed the springs to their minimum tension.
I only have one set of measurements so far but the result is that the rear wheel arches are 3/4″ higher than the front wheel arches with the Airstream in tow.
This is the best measurement I have ever taken, in contrast to previous results.
|Date||Rear arch||Front arch||Difference||Trunnion bars||Helper springs|
|8/31/2014||36 1/2″||37 3/4″||– 1 1/4″||800 lb.||No|
|9/7/2014||36 3/4″||36 3/4″||0||1,200 lb.||No|
|2/7/2015||37 5/8″||36 7/8″||+ 3/4″||1,200 lb.||Yes|
You can see from the table above that switching from 800 lb. to 1,200 lb. trunnion bars on my Reese hitch did level the load by forcing more weight to the front. Compare the first and second readings and note in the second that the back end is higher and the front end lower than the first reading.
The third reading shows the effect of adding the springs. You see the front springs remain more compressed due to the 1,200 lb. bars, but the rear springs compressed about an inch less than before due to the Hellwig helper springs.
These results are an imperfect test. The first two readings were taken on a “full-time” load out. The second reading on a “weekend” load out. Imperfect but I believe still valid. Almost all the weight difference would be found in the trailer itself and even a few hundred pounds more in the trailer would result in something fairly trivial on the tongue due to leverage. So the effect on rear axle load should be marginal.
So I am confident the springs are effective. There is a lot more room for tightening should the load increase substantially.
It’s important to note that I am attempting to ensure a level load to reduce headlight glare to oncoming traffic. I am not attempting to exceed the rear GAWR.
One final quick technique you can use to assist with leveling: inflate the rear tires 5 PSI over the front tires, ensuring the tires remain within the manufacturer’s maximum pressure.
– Anthony, Waukee, Iowa