At minimum you need to add 60lbs for the propane and whatever a battery weighs (30?). So roughly you are at 1050, which is over the 1000 lb bars you have. 1200 lb bars should handle it. What did your dealer recommend? I have 1200 lbs bars for my 314BDS. (drytongue of 950). My dealer said the 1200's should work.
2011 Jayco Eagle Super Lite 314BDS
2013 Chevy Silverado 2500HD CC 4X4, 6.0 Vortec, 4.10 axle
Reese Dual Cam Sway
Wife, 2 kids and dog