Hi Flinch, welcome to TruckConversions.net! I applaud your decision to use an HDT to haul your trailer. There is a Kenworth dealer near my house and I love those T660's. Have you looked around over at the Escapee's HDT forum: HDT - Escapees Discussion Forum
Lots of people over there doing what you're planning to do. Good luck. Keep us posted on your progress.
'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio