Multiple Items – Different Shipping Costs Help!

I’m in need of urgent assistance from anyone that may know the answer to what I’m after (whether that is a setting or setup within the WooCommerce settings that I may have missed, or a plugin install needed):

I’ve been setting up an e-commerce shop for a car company who sell car parts, merchandise etc. When it comes to delivery/shipping they would like small/medium items to be priced at £4.75 delivery charge and large items to be set at £4.95. I feel I’ve set this up within the Woocommerce Settings section under shipping zones, labelling small and medium items at the specified prices, however a requirement from the client is wanting multiple items in the basket/checkout to change to £4.95 delivery/shipping costing – for example, if a customer is purchasing one item, they can checkout (whether that be a small/medium/ item) it’ll be priced at either £4.75 (small/medium item) or £4.95 (large item), however if the customer adds 2 or more items (either small/medium/large) the shipping cost will be £4.95 no matter what. Basically a single item be priced at £4.75 (unless a large item which is £4.95) but anymore added to basket it is priced at £4.95 delivery/shipping.

Another complex setup of item for the client is when they sell a vehicle in the vehicles category, that requires no delivery and only ‘local pickup’ which I think I have resolved/configured correctly by setting up a Vehicles shipping zone for local pickup setup.

I have set up 3 shipping classes but just need assistance on what to do and if the correct configuration? This is for a client so urgent assistance please! Happy to have a phone call, would be a lot easier!

Thanks in advance!

The page I need help with: [log in to see the link]