wider tires tend to do that. an alignment wont fix this problem. but definitely check for loose nuts and bolts. i have tthe same problem on roads that are worn down with ruts. its just the uneven contact on different angles the tire wants to go up and down the rut.
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00 T/A NBM
04 Silverado SS - Sold 
00 Trans Am WS6 NBM - Sold
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