Hi Rking,
Welcome to the Heartland Owners Forum and to the family. We have a great bunch of folks here with lots of information and all willing to share their knowledge when needed.
Be sure and check out our
Heartland Owners Club. Join us at a rally when you can and meet lots of the great folks here and make friends for a lifetime.
The lug nut torque should be max at 120#, size of nut I don't know, but some one will jump in with some info for you soon.
Enjoy the forum and your new unit.
Jim M