Please help! Is this buyer of my trailer trying to scam me?

It is DEFINITELY a scam. I had a very similar experience, where I received the check first, and I figured what the hell, I will deposit the check, wait until it clears, contact my bank and have them tell me when it is guaranteed that they can not take the funds back. 3 Wells Fargo customer service reps guaranteed that the money was mine, so I paid for the shipping costs, only to have the funds taken the next day. I was pissed to say the least!!!!! Wells refused to honor their guarantee.

(Item for sale was not a trailer)