2010 tacoma vibration?

Hi after owning my new tacoma for a week now i noticed at speeds about 75-80 mph i get a vibration from the rear like the tires are out of balance, also from time to time at highway speed above 55 i can feel a slight vibration in the steering wheel. Before i call the dealer i was wondering if this is normal giving how light the truck is or if it is just the way the truck tracks going down the road. Or if the tires are out of balance or possibility flat spotted, the truck was built in January and i bought it last week with 50 miles on it. This is a 2wd 5 speed 4cyl std cab base model tacoma with dunlop grandtrek at20. This is really the only issue i have with the truck so far, thanks in advance.

 

sounds like tire vib

 

So is this normal for these small trucks?

 

Switch the tires around see if the vibe changes - or take it and get them balanced

 

i had the same problem with mine it was the cheap ass dunlops they have on there

 

yeah thats what i was figuring i even said to the salesman i wish it had the firestone tires on it. But i guess ill make a call to the dealer and see if they can help. thanks guys