Recommendations for a mat under the floor on a camper trailers

[McTavish]

Heavy Duty Shade cloth also for us...   dries in no time and the dirt / mud just falls off... 

[trueblue10]

A very wide range of products used. Interesting. What prompted me with this I was cleaning down my camper with a hose and soft brush in the front yard with a ordinary blue tarp under the main tent. Even tucked the extra trap outside the floor area under the canvas so it would not pool. I still found I had a significant amount of moisture/water under the PVC camper floor when I packed it up the next day after being in the hot sun. It obviously trapped between the tarp and camper floor.

Oz Trail Ultramesh sounds interesting.

[Bobsan]

We use marine carpet under the floor also a smaller piece for inside of the camper trailer tent, it reduces the  likelyhood of floor damage from  both sides.

[Paul and Bern]

Shade cloth for us as well.  Keep an old towel to dry the tent floor and the shade cloth doesn't seem to kill the grass as much like a poly tarp does, mustn't sweat as much.
Paul