Trailers gone wild (fishtailing)

[MushCreek]

An update. It turned out to be a couple things. Lowering the tongue improved it maybe 75%, and taking 200# out of the back helped also. With such a short trailer, having the hitch too high essentially shifted the center of gravity back- not good. It's still a bit squirrelly at high speed; I think radial tires would help some. The axle alignment is spot-on. There was noticeable tire wear in a 600 mile trip- I guess all that fishtailing takes a toll! Thanks to all who participated!

[Socal Tom]

My 2 cents,
If the tongue is raised then tongue weight measurements are incorrect as you've figured out.
If you have 3k# in the trailer and 1750# springs, when the trailer is swaying you are close to max on the springs, and they will "bounce" causing more sway unless they are dampened with shocks or trailer sway control.
Tom

[jeff0520]

Very simple rule of thumb to avoid this problem....At least 60% of the total weight should be forward of the axle.