I have a 1999 Ford F350, dually, 7.3 w/410 rear in (6 speed manual); I am looking at buying a Grand Design/ Reflections, model 303RLS. The GVWR (lbs) is 11,995; UVW (lbs) is 9245; hitch weight is 168...
I would say you are good to go! May be close on the GCVWR, but with the 4.10's should not really be an issue. My 5er has a GVWR of 12,360# and a dry of 9,820# gross about 11,000#. I am over GVWR on my TV, but well within axle and tire ratings. I have no issues with a GCVW of 19,000#+.