Mixed shipping options together in cart

Hi

I am making a site for a furniture store that sells both large and small items.
Large and small items have their own seperate shipping class.

small items can be shipped with the postal service.
Large items need to be transported by a truck.

My problem is that if a user has both small and large items in checkout he has both options. When I want him only to see transported by truck option.

Can anynone assist me? seems like a simple problem, but I haven’t found a plugin or a function to do this.