The front passenger side of my car sounds like it is going over rumble strips, intermittently. It started about a week ago sporadically and has gotten more frequent.
My gut says to check the front wheel bearings (or have them checked). I will be interested to hear what the mechanics say.
If it only makes ruble noises when you hit a bump, look at the strut mount and the stabilizer bar links. If it rumbles all the time and rises in pitch the faster you go, likely wheel bearings.
I am thinking a separated tire.