Here's what I've got. '54 chevy, original 235 engine, 4 speed granny in the floor- all in excellent shape. I need to pull a 2 axle trailer with 2000 boat, surge brakes on trailer. If I put the largest shocks I can find on the rear end, and I make sure the drum brakes are in very good shape, can I safely pull this load? I'm not talking about pulling the Rockies- just mild rolling hills.