Dual Axle Trailer Chassis

I purchased this axle chassis to replace a damaged one on an Athearn 45' van trailer. I did not receive the item as pictured with mud flaps. I read online that the version I received is the current version and comes with air tanks, but no mud flaps. I removed the tabs on top of the chassis shown in the picture to mount the assembly closer to the trailer floor. I glued the chassis and it worked great.