Can class 3 towing hitches just be bolted in or is there any welding or drilling required? What brand hitches are recommended? Getting a hitch in the next day would love some feedback. Also how much weight is too much to tow for my Blazer? See sig for details. Mark 1985 K5 Built 330HP crate 350, SM465, NP208, 10 bolts, Ranchos and 31X10.5 on Rallys!