Add percentage based fee/tax to specific product types on checkout
In the interest of anyone else who is looking for an answer to this, here is how I solved adding tax to only specific product types, based on comment #1 here: https://www.drupal.org/node/1251444

Add elements to the rule applying tax to the line item


Entity has field: Parameter: Entity: [commerce-line-item], Field: commerce_product
Data Comparison: Parameter: Data to compare: [commerce-line-item:commerce-product:type], Data value: YourProductType


Add OR/AND for more based on needs.

Hope this helps someone!