We have to ship a lot of long stuff, which they sometimes add the excess size fees onto. I've sometimes made a note by the products that this will happen on. It's not a bad idea, because a matter of just a few inches can change the shipping cost significantly. Many customers are either living in the 80's when it comes to shipping fees or they are simply paranoid about a higher fee being a scam. It can't hurt to explain what the deal is. I personally wouldn't try and justify every single thing though, because after it while it just makes you sound like your making excuses for everything.