I had a call, today, from an owner 2004 Baron) who says the floor is getting soft around the drain holes.

My suggestion is, since the mat covers everything anyway, Go to a sheet-metal fabricating shop and get four 12 gauge plates (pieces) of stainless steel (BEST) or galvanized (OK) metal with holes matching the drain hole locations. Place one on the floor and one beneath the floor at each drain hole. Use 1/4 x 2" "carriage bolts" , one in the corner of each plate, with washers and lock washers on the piece under the floor.

Before you attache the top plate to above the floor, apply silicone caulk (aka silicone for kitchen, or bath, or windows) using a caulking gun around the hole and the perimeter of the plate. You can buy this stuff at any hardware store or Lowes/Home Depot.

If you are not a do-it-yourself'er, either ask the sheetmetal show if they will do it, or call around to body shops. Many auto mechanics will put it together if you get the components. 

Make a note: Clean the bedding out of the trailer if it gets wet. Keep the windows and back door closed when in storage. 

Happy Trails!

Jeff
570-401-4843
Jeff@KurtzInPA.com