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on chevys usually the frame is drilled for a receiver. if not you are in for some fun if you choose to DIY yourself. first you will be on your back looking up and getting a facefull of chips(metal) in your face and eyes. second the pressure needed is ALOT to drill holes in any frame. so hit penske or u-haul they will either put their drill jig underneath and in no time the holes will be drilled. or they will put on lift and wearing full safety mask use an air drill with lots of psi and your holes will be drilled. class III and class IV receivers are all the same w/exception of dimensions for your particular vehicle. if you have a junkyard around you may find a yukon with one from factory and scarf that up cheap. after they bolt to frame with grade 8's its not a bad idea to ask them to place 2-3 tack welds on both sides also.
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