Walter,
I don't believe that you will have a rougher ride with a twin screw. You will be than happy to have the extra braking. I think that the downside to using a used truck is the mechanical break downs that will occur ever now and again. Most of the reconfigured cabs are 5 years old or older. If you are not mechanically inclined then go with a new chasis. If a little preventative maintenace and some general repairs don't scare you then go with a used chassis. I am a firm believer in more is better...so go with as much horse power as you can....
Show Hauler and Haulmark will be happy to build any of the shorter lengths that you want. You will loose some basement space with the twin screw but not that much. I have no knowledge of Wildside or Cobra. I believe that you should talk to as many customers of each manufacturer that you consider and get straight answers from the "horses mouth". Learn from their expeiences. Research is you best ally.
Wick
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