When you first roll forward there is like a vibration/ shutter. Then nothing when you driving when you slow down same thing. I took foot of brake a slowed down on its own a shutter / vibration there /. I am running 30 muddys on ute. There very nobby tires.
You have to try to zoom in on the source of the vibrations. Without any indication of what or where the vibration is coming from, it is impossible to understand the cause and provide recommendations.
Does it occur when transmission is shifted to neutral when slowing down?
At what vehicle speed does it start vibrating?
At a guess, I would say it seems to be drive train related and you should start with checking the U-joints ofdifferential shafts.