Re: Adding towhooks...
Neither a welder nor a metalurgist, I had a local blacksmith weld four hooks onto my jeep. The front two are welded to a 1/2 inch mild steel plate which servs as a winch mount. That plate is bent on both sides so that it fits snugly down over the front frame members. Four 1/2 inch grade 8 bolts attach the plate to the frame. Also welded to the plate is a 2X4 steel tube front bumper.
The way the hooks are welded is along the bottom and through the bolt holes (a plug weld, I believe).
A similar plate (1/2 inch thick) made from a steel beam and shaped like angle iron forms my rear bumper. Two hooks are similarly welded to that plate. In this case the plate is welded to the frame cross-member and has two extensions that go under the frame at the rear shackle mount. These extentions have holes through which the rear shackles are mounted (bolted to the frame).
All hooks have been used extensively since 1986 on various extractions including my own. None have shown the slightest hint of failure. All appear cast and were rated at 20,000 lbs. Are you giving me reasons to lay awake at night? Can you explain further why cast hooks should not be welded to steel? I'd appreciate any and all insight you might have.