Bought this and never got around to installing it. It's enough to do under the bed and seats on the 19. And may be enough to do the others too. It's used to allow air flow so moisture does not build up. We decided keeping ours enclosed and using a dehumidifier was all we need as we do not go into cold climates for lengthy periods.
It's a big box so it would not be worth shipping. We live in Florida so it could be picked up here or if you are going to the King of the Wild Frontier rally in Limestone Tn we could bring it with us.
Here's from the receipt for it.
Aire-Flow™ Moisture Barrier
Sold by the Foot (select qty below)