I dont think a bus was what Mike had in mind. But I drove an old bread truck, like the current delivery service Van's. Steps to enter, big windows, converted with bench seats/storage under, small table for logbooks.
If you want to stick with towbehind -- how about a pickup bed trailer? The little half tons are lite to hitch, carry a full ton.
(It is a lesson in CG packing.) Could have fold out awning for wet/sun protection for ground crew. Could tow with a soul or three on board for a scamper team to clear a runway.
ATVs might look cool, but golf carts beat them for utility in staff transport.
Let me know if you need a photo for clarification.

Cindy B