Does size really matter when it comes to turbulence & the size of the aircraft. Actually very little. It's more about the atmosphere & the weather that will determine if you get turbulence. For instance, you can be in a small single-engine Cessna one day & it could be a smooth flight or a turbulent flight. The same can be said in a heavy jet. It all depends on what type of turbulence. Is it turbulent because of thunderstorms, or cold from passage, or mountain wave over the Rockie?. If you have weather patterns occurring over a certain region of the country you are going to have turbulence regardless of the size of the airplane. Likewise, if you have smooth stable air with a high pressure going on you will likely have a smooth flight regardless again of the size of the airplane. The type of cloud patterns too will determine if you fly through them smoothly or get a small ripple. Regardless, turbulence have little effect on an aircraft then make you feel a little uncomfortable. For instance, if you place a glass of water on the tray table it probably would not spill over. If you view the cockpit control wheel while turbulence is going on again you will see little movement. The wing of the airplane is built to be flexible  & no turbulence can snap it off. View turbulence as gravel on a road & something you have to drive over to get to your destination.