My 07 2wd with 20's a lot of times when I am driving down the road the rear end wobbles, you can see the bed bouncing up and down. What would cause this, could it be wheels out of balance?

 

No one?

 

I suppose it could.

 

Could be, or could be shocks, or could be you loosing your mind and it's actually not moving but in reality it is just you bouncing in your seat...Rebalance is usually free from the place you bought the tires, I'd try that before checking yourself in...

 

I guess a wife and 2 kids could do that to me.

 

start with the cheapest and get all 4 tires balanced. they work themselves out of balance. get them to tell you if they all balanced out, sometimes you can have a bent wheel or something that will cause one to not be able to balance. then do rear shocks.