My 2009 Reg Cab had a squeak from the driver side rear leaf spring at about 10000 miles. The dealer said the springs needed some sort of lubricant between the leaves. That seemed to correct the problem until now. At about 30000 miles the problem has returned. When I take it in I am afraid they will repeat the same "fix" only to have it return later.
I live on a dirt road in rural Michigan so it probably sees more mud and dirt than a city truck, don't know if this a contributing factor or not.
Any help before the warranty runs out would be appreciated.