I have hauled heavy all over the country and went through 5 NV4500's and 3 G56's and would NEVER EVER consider another one of those transmissions! I have had issues with automatics too, and pretty much quit using newer trucks because of it. Clutches are one issue, but the transmissions are another, the G56 simply cannot handle the Cummins! I also would never consider a SRW with a 48' enclosed, dually only at the length and weight, been there done that.