What is the big rectangle thing in my mirror?

After 23 years of driving commercial vehicles, dumps, low boys, and mostly rollback/car carrier I will be pulling a box trailer tomorrow. We have a contract to auction off a large communication company's vehicles when they retire them and I have to go to long Island and pick up a box trailer. It will be a double whammy, 1st time pulling a box and 1st time back to the city in probably 8 years. Any advice for things to look for on a trailer that may have been sitting for a long period of time? It's definitely going to be strange not being able to see through my trailer like usual. lol

 

Copy on the normal suspects, I don't think the registration matters in this case as the trailer IS my commodity.

 

I have never slid tandems either as car carrier is fixed. I don't think it will be necessary as I only have to make 2 turns and then I will be back on 495

 

I resemble that statement.

 

I would feel naked with just sweats on lol Well, I'm off so wish me luck. If I don't return here you will know the big crapp hole sucked me up.