Flooring Material Suggestions?!?

Okay, we completed our first Teardrop - only to have a customer want it more than I did... So, now we are prepping for our next build and will again go with the lightweight aluminum framework with aircraft fabric to skin the unit with again. I am planning to change the flooring to something softer or even some type of padded material. Keep in mind, other than two smallish storage areas, the unit is really for toting our dogs in (behind our Goldwing motorcycle) and only camping in when needed, so the material needs to be durable. Any thoughts?!?