Plan of action:
I need new tires on the back anyway, so I'm going to get new tires and then have those wheels and tires rotated to the front. if the vibration goes away or moves to the rear, I'll know it's a wheel, tire, or balance problem.
If it continues, we can move on to the more expensive options like suspension, bearings and axles.
Sometimes the 'more expensive options', if not attended to, will cause wear on other components..
For example, a strut that no longer dampens vertical oscillations will cause tire tread to wear unevenly and wear more rapidly, causing the new tire to become unbalanced and wear even more unevenly. Some of those items may not by themselves be noticeable when driving, yet will undermine the longevity of the other items.
Slop or wobble in the steering or suspension parts can also aggravate tire wear, or other suspension parts.
You mentioned the roads being harsh. That suggests increased likelihood that more than one aspect could be suffering from wear.
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