Do not weld your hitch brackets to the frame. If and when your truck is sold and it goes to the auction, it will run thru the auction as "Frame altered or damaged" which effects the value of the truck. A used car manager who is sharp will take that in to consideration when trading for a unit that has had welding done to the truck. Does it hurt the frame... ... ... . I don't know, I am not a metal engineer. Does it hurt the value... ... ... yes, I am a dealer. Mi dos pesos... ... .....