I tried to take a couple of pictures but hard to tell much from them. About as hard to take a picture as it is to work through the access opening. I used two strips of 1/2" good grade plywood about 17" long and 3 1/2" wide. Glued them together and put a couple of short screws to hold them together. Gave me a solid 1" thick plywood bridge across the floor opening. 17" long worked out to be about as long as I could maneuver and wiggle into position. Gave me a good amount of support on each end that was on the floor of the trailer under the shower. Then cut a 2x4 leg (trimmed the original one) so that I had to push slightly up on the shower floor to wedge it into position. Put a lot of glue on each end and then slid it in place. It was a chore and took several attempts to get it in place, plenty of glue and the bridge still where I wanted it. Things slide, move, shift, etc and not much room to hold onto things. I also put some thin wood shims under the two front legs. They were not as tight as I wanted them to be against the floor. Hope this helps. The 2x4 post just to the left of the drain is the one I put in. To remove the 2x4 support you can push it back and forth and then pull it loose from the long staples that come through the top into it. Came out fairly easily. You can see (sorta) that if the plywood bridge support were not there it would be hanging in mid air over the cutout for the shower drain, which it was.
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