see here used various used equipment of theirs most cases brand is refereed to as JBT Aerotech
https://www.machinio.com/jbt/airport-ground-support


example this towed stairs
https://www.allsurplus.com/asset/525/19344?utm_source=machinio.com&utm_medium=re- ferral&utm_campaign=machinio
Make/Brand
JBT Aerotech


mis-id
https://www.imcdb.org/vehicle_444477-MTZ-801.html
https://www.imcdb.org/vehicle_776267-Zetor-8011.html