Vibrations.......not good

I have had several Toyota pick-ups over the years; 81', 94', 99' 04', and now an 06' Tacoma (still have the 81' 4x4). I have also worked at Discount Tire Co. for several years now. The only complaint I have ever had about Toyota Pick-ups or SUVs by myself or the customers I deal with at Discount Tire are vibration issues. For some reason, which I don't know why, Toyota pick-ups and SUVs (not cars) are the most temperamental vehicles on the road when dealing with vibration issues. Especially after replacing the stock tires or the stock tires and wheels. I have after-market wheels and tires on my 06 Tacoma and I knew going in I would have vibration issues and I just deal with it.
Sorry I don't have an answer as to why, but I do know its not just the newer vehicles but the older models as well.

 

no vibrations here but whats this TSB stuff??? never heard of it

 

there are a few threads about the TSB (toyota service bulletin) under the 2nd Gen. tacomas forum. toyota is replacing leafspring packs due to customer complaints about harsh rides and bottoming out with a load in the bed on the 05-07 4x4 and prerunner tacomas

 

thanks for that info...so im also gonna assume that this replacement spring package is what toytec is talking about when they say to use the rear block with the factory replacement instead of the aal???