FastEagle bring up a good point.
The 36RE Cedar Creek in your sig comes with 8 lug G rated Goodyear and 7k axle. The rig has a 16400 GVWR. I'm guessing the Goodyear G load range is the 16 " 3750 lb rated G614s.
The Firestone's you mention are a 16 "LT E at 3042 lbs capacity. Thats well under your trailers 7000 lb axle or 3500 lb per tire requirements.
Are you having issues with your tires on the 2012 Cedar Creek or are the Firestone tires for a different trailer ??
The 16" Firestone Transforce LT E are a very good tire for any trailer with 6k axles and smaller.