HELP. Need info on max. towing w/ Dodge Ram 1500

Can anyone tell me how many pounds I can safely tow a 5th wheel with my 2008 Dodge Ram 1500 Hemi, quad cab, SLT, 2WD,6.25 bed, 5 spd. auto 545RFE transmission, 5.7L V8 Hemi engine, 3.92 axle ration, 2...