I need to install a receiver hitch on a 79 blazer, I had a makeshift hitch on my blazer but i had the dual exhuast routed out the back, so i had to cut the hitch off to make room for the exhaust pipes. now i need a different hitch to go back with. does the gas tank have to be dropped and holes drilled into the frame to mount a receiver hitch? Thanks for the help. Life is grand in K-5 land!