X 720 w/ Special Edition Pkge.

I am about to take delivery of a new X 720 with the Special Edition Package. I will primarily be using this to push snow right now. My dealer tells me at the last minute that you can not add wheel weights to this model due to the way the wheel has been manufactured. She took it upon herself to order the Suitcase weight bracket and some suitcase weights. This tractor is replacing a stolen 140 that I had for a number of years, when it was taken it was set up with the blade on it and wheel weights, and lug tires. I had seen very favorable comments on this site about the HDAP tires in the snow. Two questions are, is this true that I am going to have to use the suitcase weights instead of wheel weights, and is there a way that I can look at the serial number on this tractor and be able to tell the manufacture date of this tractor. Any feedback from anyone having one of these would be greatly appreciated. Thank You.:thanku: