j2kdrv, welcome to iRV2.com. We are glad you have found and joined us here. I believe I have heard it said that one would want 100 hp per 10,000 lbs of weight. If this is true, the rig you have discribed would be light on enough hp and torque. You may want to check on other large C conversions like Showhauler or Dynomax.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7