Rumble strips

I have seen quite a few people complaining about the same thing but not one person has found out what the problem is and had it fixed. I can't be the only one. I have a
Toyota Tundra 2006 some where between 30 - 45 mph my truck sounds like it's going over a ruble strip, last just a few seconds but sometimes up to 5 or 6 seconds. It happens almost every day sometimes every other day. Has anyone found out what this is and had it fixed?
Help!
With so many people having the exact same problem I would think there is just one thing causing the problem.

 

Torque converter

 

I was reading something about a bearing that supports one of the front driveshafts going out that was being replaced by an aftermarket bronze bushing to fix it.Iam trying to find the write up.

 

Thanks Trident

 

You're welcome

 

My first thought was to put the phone down. You're running over the "Text Strips" the DOT has ground in to the roadway surface.