Rear Leveling

I just installed the 1 inch Toytec leveling kit in the rear, 2.5 on the front of my 2017 Toyota Tundra; it rides like a tank and there is a strong vibration in the steering wheel. I added BF Goodrich 275 65r 20's on a Black Rhino Warlord wheel with a 12 offset. Toyota says it's just how it rides with a leveling kit? Any thoughts on what's causing the vibration? The front was added last week with no vibrations.

 

I did, forgot to add that.

 

The vibration is from the wheels IMO. Either alignment or balance. I've read that new tires can be faulty and every once in a while people have had to have brand new tires exchanged. Was it aligned after lift?

 

What he said ^
That can fix a lot of "problems"

 

I had a set of BFG all terrains on a 2015 Silverado. No matter what they did 1 of them would not balance. I was going to demand a replacement tire but truck turned out to be a lemon. 7200 miles, towed in 6 times.
I've always had good luck with the BFG's. It was just that 1 bad tire.
I now have a 17 Tundra, 2500 miles. I put 6112's up front to level and 5160's on rear. Rides great, no vibration. I still have the stock Michilen tires.