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Old 04-25-2018, 04:22 PM   #1
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How critical is "angle of attack?"

Picked up the new to us 2017 27FB last week. From the dock, home was a little "sporty" with the first-try of the Anderson no-sway by the book and a measured 690# tongue weight. After i got home, 50 miles away, I raised the ball one set of holes and headed to the scale, about 10 miles away. Still some wiggle at 4-5 threads showing, and steering axle showed 120# lighter than unloaded TV. It took 6-7 threads showing to put the steering axle back to within 100# of the 3240# unladed weight. And the ride home was much better, but not what i would expect.

The TT is slightly nose-down at 21' to the rub rail at the front, and almost 24" at the rear. Is it possible this relatively little nose down contributes to a bit of remaining "wiggle?" I can raise the ball one more set of holes.

As currently set, by weight and inches to the inside of the TV wheel well, the front of the TV is within 1/2 inch and 100#s (lighter) of pre-load measures, rear wheel well measure is about 2 inches lower than pre-load but matches the front, and weight is about 500# heavier than the front.

Thoughts, opinions, data and anecdotes welcome.
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Old 04-25-2018, 04:30 PM   #2
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I’d try raising the ball. The nose-down might be causing your “wiggle”, AND it sounds like you’ have considerably more weight on the front trailer axle. A little nose-down is better than nose-up, but 3” is too much.
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Old 04-25-2018, 04:52 PM   #3
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measure the ground - fender gap on all 4 corners unloaded
measure the ground - fender gap on all 4 corners with trailer on

the left & right should be the same
front and back may not be

note what the unloaded delta is ie 21" F and 20" B

note what the loaded delta is ie 20" F and 18" B

notice how the delta went from 1" to 2"
this needs to be corrected

you may end up with 19.5" F and 18.5" B
now you are back to a 1" delta, you are now balanced

WD will help.
best to find a trailer scale place that can measure three points
TV front, TV rear and trailer all at the same time
the two TV values should be a rough 50-50% split

if the front is too light , you will loose steering,
if the rear is too high, you loose traction ( in 2 wheel drive)
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Old 04-25-2018, 05:02 PM   #4
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Thanks heaps for the responses.
unloaded: front 37.5" rear 39+
loaded with 6-7 threads showing on the Anderson hitch adjustments: front 37.25", rear 37".
What say you?
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Old 04-25-2018, 05:19 PM   #5
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I always take three measurements, whether height or weight. First is TV alone, second is combination without WD activated, third is combination with WD activated. I try to get at least half way back to front axle TV alone measurement from combo-no WD and don't worry too much about rear axle. It was easy on my F-150. The Ram with the diesel doesn't lift much and it doesn't want to go back very far without putting a lot of WD on which I think is hard on the trailer and the receiver.

Also try to get trailer level front to back. Not being level unbalances the load between the two trailer axles. If your are close to the limit, one may be over if not level.

Al
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Old 04-25-2018, 05:42 PM   #6
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Depending on your hitch another factor is the "head angle" of the ball. Check with your hitch manufacturer.
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Old 04-25-2018, 06:26 PM   #7
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690 sure sounds light to me for a tongue weight of a 27'. Yes, it needs to be a little more level. I have never used that brand of hitch. With my hitch and truck I would think that within 100 lbs on the front axle would be enough weight transfer. That is about what I run at. I would want a little more tongue weight.
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Old 04-25-2018, 06:30 PM   #8
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Raise the ball to level the trailer. It sounds like your WD is dialed in pretty good.
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Old 04-25-2018, 06:37 PM   #9
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I don't have any useful comments regarding the Anderson hitch since I've never set one up. A friend had one and he liked it.

However, I would do whatever is necessary to make the trailer ride level. Our 29' Classic is within 1/2" and the front & rear axle loads on the trailer are very similar for our setup. If your trailer is nose down it may be contributing to a "heavier" tongue weight too.
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Old 04-25-2018, 06:37 PM   #10
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Andersen WD hitch is not recommended for the Airstream coupler. As well they don’t do the best job of weight distribution and offer almost no sway control. You might want to try a more conventional WD hitch.
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Old 04-25-2018, 06:54 PM   #11
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Andersen WD hitch is not recommended for the Airstream coupler. As well they don’t do the best job of weight distribution and offer almost no sway control. You might want to try a more conventional WD hitch.
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Old 04-25-2018, 07:40 PM   #12
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The Andersen is known to not have strong WD capabilities so it's possible between the slope of your trailer and a possible lack of front axle restoration you don't have the kind of control you want. With an F150 you may need 100% FALR - a 3/4 or 1 ton (esp diesel) isn't going to be impacted much on the front end.

For the weaker WD, coupler incompatibility, and yes, the defacing of public property problem - I wouldn't recommend an Andersen. Practically any other conventional hitch will serve you better.

Good luck!
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Old 04-25-2018, 08:07 PM   #13
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Had an Anderson hitch for my 27FB. Was never able to get, what I felt, proper weight transfer. Tightened the bolts to the point where the red rubber parts distorted almost to a ball shape, and the friction material around the pivoting ball unit squeezed out in a distorted manner. Basically it was failing while barely meeting weight distributing needs for trailer.

I replaced the Anderson with a Equalizer hitch. Vastly superior for this purpose. Very good at weight distribution, durable, and good at sway resistance.

You can keep tinkering with the Anderson, I did for awhile, but will probably be quicker for you to just move on.
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Old 04-25-2018, 08:15 PM   #14
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@pjshier

see my post about the delta unloaded - loaded

you have too much weight at the back, thus your front end is too light

you are NOT balanced thus you will lose good steering over bumps

see the other posters and find a good commercial trailer scale like CAT scale
there should not be more than 300lbs difference between front and rear TV axle weight

i have the eazlift WD and eazlift sway control. mine looks very similar to this one
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