Floridaguy80

2013 Eco, crew cab, 2wd..

I just purchased a brand-new trailer empty trailer weight is 2400 pounds. When I brought the trailer home the truck up to 70mph drove perfect..

Today I had approximately 2000 pounds on the trailer and I noticed when Between 40-50 mph, The truck was noticeably shaking.
Below 40 miles an hour it drove nice above 50 mph it drove nice I don't understand why I was having such a shaking affect on my truck between 40 and 50 mph..

Based on my calculations from topics here on the forum I am able to have a trailer and load weight of approximately 7600 pounds.. So I know I was nowhere near my maximum weight limit today..
Any ideas?

EventHorizon

I'll start with the questions that everyone will ask:


Going by your above statements I would assume it's some kind of cargo trailer right??


After loading did you maintain around 10-15% tongue weight?
How long is this trailer?
Is it single axle or duel? (I find singles are a bit more jumpy)

brulaz

What do you mean by shaking?
Sway side to side?
Or bounce? There are some concrete highways that have regular bumps. These can get the rig resonating pretty bad.

Do you know your tongue weight?
Do you use a weight distribution hitch?

Ricktwuhk

Did you verify the trailer tires are properly inflated? Do they need to be balanced? Is the trailer evenly loaded, or is one side heavier?

Oh - you can't tow 7,600 pounds on of trailer / load. Lots of thread about that. Max of 500 pounds tongue weight / 5,000 trailer weight without a weight distribution hitch.

And finally - go read the tires on the trailer. You should not be driving 70 mph.

SKBORDERS

Tire balance issues usually show up in a 5mph window so like 55-60 or 45-50. The window may get wider on a loaded trailer.


Also, if the truck was sagging a lot, it could be a drive shaft vibration.

Steve Osborne

i'll post this up....I rent a U-Haul car hauler on Thursday/last week to pick up my daughters car...truck is still new..i did break the 1000km mark before towing...still took it easy.....and I hope it was the U-Haul trailer cause around 80 kmph I had a shake in the truck as well....no wdh as uhaul doesn't use them..couldn't load the car backwards so yeah I had some tongue weight....truck still held it well..
so I hope it was the trailer/loading for me...

PerryB

Probably a driveline geometry / chassis resonance issue. Theres a lot of this happening with the Super Dutys.

Floridaguy80

Tounge weight was good
It's a 16' Flat Deck trailer, tandem axle

Floridaguy80

A lot of vibration.. Drove on road before with single axle trailer no issues.. Asphalt road.

Floridaguy80

60 psi in tires on trailer. With a weight distribution hitch,mi can tow 7600ish lbs