Individual forms or 1 form w/ hidden values on website?

I'm looking to move our forms to our website however I have 1 concern. Currently we have a "universal" form for each asset on Marketo LPs (i.e. 1 form for all whitepapers, 1 form for all product tours, 1 form for all tool kits, etc.) and we reference the LP for triggers. If we were to move the LP to our website (built in Drupal) and embed the form, would we need individual forms for each asset or could we continue to use the universal approach and insert a hidden field on the form that would capture a value to associate it with the proper asset?