Place for an extra spare tire

at the end of this past summer I had good tires on my 5er but ran over something and the rear tire on the trailer blew and the shrapnel from the tire broke off the stem on the front tire and there I was on the side of the road with 2 tires down. Fortunately I was only 2 miles from home so I left the trailer on the side of the road and went home and picked up 2 of the 4 extra wheels and tires I had there. I now have 2 spares and carry one in the back of the truck but shortly plan to put a spare tire carrier under the trailer with the 2nd spare. BAL makes a under frame spare tire carrier that bolts up to the frame, I just need to take the time to get some measurements and order it then install.