@naveenrajan (Naveen) - I've only recently noticed 53' trailers on tractors on the Interstate lately in my area. I've even thought about taking my phone to one of the rest stops and taking photos as they pass by since they match nothing that Atlas offers. As for 48's, I have been very up close and personal with those containers on the trailer mounts. Typically the ones I'm accustomed to are J.B. Hunt and APL.
Anthony