Heres the space I have to work with:
The lower main rail that runs front-rear is about 50x50x4 box tube, the rear rail is about 60x25x3 rectangle, crossmembers are about 40x40x3 angle (only rough guesses as I didnt build the deck so can only go by eye-rometer measurements
This is the simple idea I had in mind (since i have no special engineering tools and like to use things from the junk pile):
Its a 6mm thick bit of angle, will be welded along all seams I can get at.
Should be plenty strong enough right? Probably put a gusset in the center of the angle too.
I know blah blah welded mounts bolt on mounts, but in order to make a place to bolt too you need to weld something in most times. Only direct bolt place is thru the end of the chassis rail but dont like this idea as they dont look particularly strong n dont want to bend them snatching since the spring hangers are right at the end
), where do you draw the line. Most peoples hooks are bolted to a bullbar, which is welded together, which is bolted to a chassis that is also welded together.. but that arguements been discussed several times already so we wont go there 
