Do you have the Ford F53 chassis or the Chevrolet Workhorse chassis? I don't know when the Workhorse was an option on the Georgetown but it was before 2010.
I see from your profile you have a 2005 model year Georgetown. Those can have a 2004 or 2005 model year chassis. If you have the Ford F53 the Owners Manual for the 2004 chassis is here:
https://www.fordservicecontent.com/F.../04motog1e.pdf
On page 51 it shows the lug nut torques, which are still the same for the current model year F53 chassis: 150 ft lbs for the 19.5" wheels and 450 ft lbs for the 22.5" wheels.
Pic attached.
If you have the Chevrolet Workhorse chassis please give the exact model, usually a "W" or a "P" followed by a number.
Ray