On mine I used the Facory mounting holes and with a little grinding put a pice of 2X2 1/4 inch angle iron in side the frame rail that goes back about 24 inches, I fit every thing together & marked the holes, I then welded nuts to the inside of the angle iron. Currently I have huge washers on the outside of the frame rail, I am planning to put some 3x4 angle iron there instead, btw I used the factory bolts to mount to the original mount point and 5/8 inch grade 8 for the angle iron (iirc 6 per side) I might be able to take some pics later if you would like. The way i did mine any stress is spread over quite a large area, going way back into the frame rail (about 10 inches farther than the factory hitch mount) insures that I should not have any problems towing or during recovery.