Undercoating the floor

Has anyone covered their bottom (the floor of the trailer you bunch of wise guys!
) like this?
I was wondering about covering the underside of the wooden floor with sheet metal and then coating that in Herculiner (http://www.herculiner.com/).
I'm wondering if that would be a more durable undercoating than just the roofing tar. I'm thinking it'd only add a few pounds to the overall weight.
Thoughts?

I was wondering about covering the underside of the wooden floor with sheet metal and then coating that in Herculiner (http://www.herculiner.com/).
I'm wondering if that would be a more durable undercoating than just the roofing tar. I'm thinking it'd only add a few pounds to the overall weight.
Thoughts?