You might be best to call Forest River. I think it's more of what you frame will support vs. what the reciever will support. I have seen quite a few sagging 5vers over the past couple of years.
Dana and Natalie
2008 Chevy Silverado 3500HD LT DRW CC LB 4x4
-PPE Programmer, MRBP Exhaust, Diesel Manor Triple Gauge Pack, FS2500, 60 Aux Tank/Toolbox, Line-X, Full Tint, Curt 20K Hitch