It is bolt or weld on, no mod's needed ready to go! The trail gear bumper bolt's right on and DOESN'T get in the way of the skid plate. The Trail Gear bumper only use's the hawse fairlead but i have seen some people cut the bottom tube (which makes the bumper weak) to get a roller type to fit. You have to install the winch before you install the bumper, i found that out the hard way. No mod's needed for the Warn M8000, however install your fairlead first with the nuts toward the outside of the bumper in order to get the winch to fit. If you install the nut's on the back of the bumper for the hawse the bolt will get in the way of the winch fitting, i found that out the hard way too.