vehicle feels like it's going over bumpy rd when accelerating between 30-40 mph.

What is your question?

it has done this before and the diagnosis was a bad wheel bearing. The mechanic who looked at it said wheel bearings were OK. Wondering if this could be something else wrong with suspension, i.e. ball joints or struts or more serious like transmission. It seems to have a vibration on the left side making me think it is a suspension issue