So I am trying to add a 12000 lb winch to wood deck car hauler. I know it is a big winch but I bought it on a sale. I ...

So I am trying to add a 12000 lb winch to wood deck car hauler. I know it is a big winch but I bought it on a sale. I would have put it in my tongue box but if I did that then a lose all the use of the box as the winch fills it up.

I went and bought a universal mount from tractor supply and was thinking of just mounting it the the wood floor with another piece of metal sandwiching the wood. I also had thought about cutting the middle boards out to the next support beam and putting a metal plate there to mount to but I wanted the plate to be level to the deck floor. To make it level I need to make up the difference of 1/1/2 above the next support beam that the wood takes up. Maybe using some big angle and then plate on top? I was unsure of that because the angle I put in would go above the supports and only be relying on the weld on the support

Any advice on how to go about mounting it.

I'd definitely attach whatever mount you make to the frame of the trailer and not the wood.

either way like this would work fine.. 1/2" plate may seem like overkill but at least use 1/4" thick angle and plate.

I have welded on a standard 2"X2" hitch receiver on my trailers. This allows me to move the winch around to different trailers/trucks/tractors. Your winch mount will need the bar to go into the receiver.

I don't like my winch out in the weather if it does not need to be.