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So I keep spare tires for my coach, one for the front 315/80r22.5 and 11r24.5 for the rear. I have them in my trailer and they take up a lot of room. So I started looking and measuring and decided that I thought that I could make a couple of compartments recessed in the floor for them. I needed 13” for the height of the tire when it’s layed down, so I ended up calculating that if I made a raised section in the middle of the trailer that I could fit them in. The bottom of the compartments would not be any lower than the axles. The vehicle I use will still fit in fine, will have 3” on each side between the inside of the tires and the raised area, the raised area is 50” wide and the inside track of our vehicle is 56”. 

Cut the existing floor trusses out, they will be reused on the sides
   

Welded the side trusses in, I also boxed in the c channel trusses that will support the side trusses. 
   

Welding in steel angle supports for the recessed compartment
   

Lined the inside of the compartment with 1/2” pressure treated plywood and painted everything
   

Cut the old floor in half and put hinges on it for doors
   

Final product with tires in place
   

Got the depth just right, I am going to put rubber on top of the wheel to protect it