Hey all - long story short - ordered the combo on Friday morning from DTD and received an email with tracking numbers for 5 packages. Each weighs an identical 35.80 lbs. it looks like these tires weigh 49 lbs and wheels weigh 18 lbs. does anyone know if they mount them at the factory and then ship? If so, why would the package weigh less for any reason other than they shipped the wrong tires??