I have a 30 ft. 2011 cougar half-ton towable and don't know what to torque the nuts at. I thought it might be 70 lbs, but when I set them at that amount the nuts don't seem to be tight enough.
I have towed RVs for nearly 60 years and have never torqued the wheels on any of them ever. Never had a problem. Guess I have been lucky. I am not saying you should not bother as I know you should.