Hi ya Easty mate,
I’m guessing you’ve already thought about specialist Baggage and Cargo handling (Belt Loaders, Pallet/Container Transporters and Loaders, Dollies and such like) and other Service Vehicles, such as Snow Ploughs (If not for runways, then for Service Vehicles on your airfield) De-icing Vehicles, Generators (to run electrical supplies to Aircraft not producing their own, or enough power to meet their needs, or to start Aircraft with low battery power), Lavatory vehicles (to empty all those chemical toilets when Aircraft are on the ground) and Water Supply trucks?
Other than those, no. I think you've probably got all bases covered.
Andy