Correct Size WD Spring Bars?

[cruz-in]

Hi,

We are towing:
12000 pound trailer (total loaded weight)
Has about 1200 pounds tongue wieght
Using a hensley Arrow with 1400 pound spring bars

With
a F250 CC, 2WD Diesel

On even slightly poor interstates, this combination is beating us to death in the truck. Are the 1400 pound spring bars partially to blame? They are very stiff and beefy? Should we try 1200 pound ones? or evven 1000 pound?

Understand the TW is at the low end of acceptable (about 10%). However the hensley does not care, no swway at all.

Thanks in advance for your thoughts aand inputs...

Dan

[cruz-in]

no aiming for minnimal TW or anything like that. These Amped 32 GS toy haulers have the wheels fairly far forward and, without fresh water in the forward tanks, tend to be light on TW.

Nothing too heavy in the garage....just grills, bikes, kayaks, etc...

Can certainly increase TW by adding Fresh water and see how that affects the ride.

Yes I have weighed the TW...do it everytime I hitch up....I like to know...

[goducks10]

Are you sure on your weights? I see it's a toy hauler. What's in the back? Even though 10% TW is the minimum you may need the full 15%.

[Huntindog]

Have you scaled these weights?.

If so, then you need to rethink what is alright.
A TTs TW can vary a lot in the course of a trip. Food gets eaten and leaves the pantry and fridge and ends up in the black tank. Water gets used and leaves the fresh tank and ends up in the black/grey tanks. Propane gets consumed and disappears as exhaust in the air. Many other things may shift around as well. So it you start a trip with only 10% TW, that figure can increase or DECREASE, as the trip progresses. Yes the hensely may be keeping it from swaying, but too light a TW is still not good. A TT is somewhat like a teeter totter on its axles.... You want the tounge to ALWAYS have enough weight to stay firmly planted on the ball. A light TW can cause exactly what you are describing as road conditions cause the weight to shift momentarily to the rear.
I would NEVER aim for the minimum TW.. Those that do are usually trying to compensate for their TVs lack of payload.