I tow a 16' trailer loaded with 1 6' Mower deck , 1 6' box blade' 1 6' rotor tiller. 1 Ford 3000 diesel tractor 1 post hole digger; from Katy Texas to Junction TX.

The only problem I had was the 7% grade about 50 miles out from Junction. I dropped to 40 MPH going up it

At the time the truck had over 160,*** miles on it...and yes it was a 4.6