[Plugin: woocommerce] searching for shipping rates groups plugin

Hi there!

I am searching for a Plugin that makes it possible to give different shipping costs depending on shipping groups. For example:
I sell light and heavy things. So I need two groups with different shipping costs because they will be packed different:
light: $2
heavy: $5

Now there should be options for following orders:
1. Order of light stuff (doesn’t matter how much): $2
2. Order of light AND heavy stuff: $5 (NOT $7!)
3. Order of heavy stuff: $5

So shipping costs should have a maximum relating to the highest shipping group cost. That should not be responsive to the number of items. With the regular shipping group solution of woocommerce that is not possible – it would always also give all options when shipping or will sum the groups up (to $7 as above).

Anyone an idea or plugin hint? 😉
Thanks!