So, have almost 227K on the truck in my sig, I believe on the original clutch. I can slip it at will with the Bullydog on performance or tow, particularly with a trailer. I'm debating between a Valair HD single disc or a street dual disc. The most this engine will see is tuning, the fuel & turbo will stay stock. Do I really need a dual disc? That's another $400. My towing is a 7500# gross 5th wheel and a duck boat behind that, about another 800# or so. Thoughts?