The bumper mounts will be plenty strong enough.....it all depends what you make to bolt to them....
I'v seen landrover boys rip off welded on winch bumpers because their welding was.....errr......sh!t...!
So whatever you make, make it good quality and it'll be fine....
Most cars have a tie down / winching "loop" on the back, and crashed cars often get pulled onto transporters backwards by this "loop", which is often held on with a few spot welds........
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