This seems to be a common issue on the newer F53 chassis. Personally, If I owned a newer unit, I would make this an inspection item before every trip.
The older units used a heavy duty pillow block. Mine is a 2001.
Put blue locktite on the bolts and torque down to 100 ft lbs.
Scroll down to the bottom on this link and you can see what the older models used.
Cheap Handling Fix – and then some | 2001 Coachmen Mirada 300QB