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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
What chassis is your RV on?
A failing steering gear or worn bushings on the suspension components is one possible cause.
Hello again Chris here,
You're the first I have ever heard say the Ford F53 chassis is junk. After the mentioned repairs if the steering wheel is still moving then I would look into a steering gear needing replaced.
If the front tires are vibrating you should be feeling this in the steering wheel. Since you are not, are you sure this is not a rear driveshaft U joint or carrier bearing or drive line angle concern?