Inner wear on the front tires

Have had both the Chevy and Ford cutaway vehicles with cargo and ambulance bodies on them. The first thing all of them need after the body is installed and you load them up ready to go, is to have a front end alignment done. The front end settings will change when the load is placed on the rear frame rails. On the Fords after the adjustable alignment sleeves were installed, they seemed to hold it longer than the Chevys. The Chevys had more bushings and linkage ends to wear and get sloppy. On the vehicles that were changing the load all day long they would use more front tires than the units that stayed loaded all day.