As just about all of us have read here, certain models of WW trailers have defects that have resulted in a number of different problems. To one degree or another, this subject has come up on this for...
I have an 06 FK2100. Love it! Have had no issues. Mine does have the thicker tongue also but I would check yours since it is an 04. I haul 2 full size polaris sportsmans. When loaded with everything but water I have about 6300lbs. on the axles and about 800lbs on the tongue. I tow it with an 03 1/2 ton GMC. Tows great but a little sloww up hills.
The only mods I have made are upgrading the tires to 225's with a "D" load range and adding a tie down point in the middle of the kitchen floor.