Multiple Shipping classes/methods – product question

Hi there – I need some advice.

I am using WP 4.6.1 and WooCommerce 2.6.8
There are only 2 products in the shop currently. 1 is a single item product and the second product is a double item product.

Both products ship to the same locations here in New Zealand (so location based shipping doesn’t matter) – however, there are 4 shipping costs depending on the type of shipping option. i.e.

1) Rural $5.00
2) Urban $3.50
3) Track & Trace (1-3 days) $5.50
4) Track & Trace (overnight) $7.00

This works exactly as expected where the customer can select their shipping type and it adds the cost to the order. HOWEVER – what we also need is to double each option (price wise), for the double item product. So if the client chooses product 2 (double item), the above prices will double in the cart.

How can I achieve this please?

Thanks in advance.
Chris